Find the sum of 5-9i and -4+7i, subtract 14-3i

Answers

Answer 1

Answer:

-13 -i

Step-by-step explanation:

The first step is to find the sum

5-9i and -4+7i

Add the real parts and then the imaginary parts

5+-4 = 1

-9i + 7i = -2i

5-9i + -4+7i = 1 -2i

Now we subtract 14 -3i

1 -2i - (14 -3i)

Subtract the real parts and then the imaginary parts

1-14 = -13

-2i - -3i = -2i+3i = i

1 -2i - (14 -3i) = -13 -i


Related Questions

Stuck at this question I need in 5 mins! Need it ASAP

Answers

Answer:

64 plants/32 seed packets =

2 plants/seed packet

90 plants ÷ 2 plants/seed packet =

45 seed packets

How do you simplify that?

Answers

Hey there!

You could solve those equations many ways but, here's a more "Easier way" to  solve that

[tex]3^3[/tex]= [tex]3(3)(3)[/tex][tex]3(3) = 9,right?[/tex][tex]9(3) = 27,right?[/tex]Therefore: [tex]\boxed{Answer: 27}[/tex]

Good luck on your assignment and enjoy your day!

~[tex]LoveYourselfFirst:)[/tex]



Jin spent 32 hours on math and language arts homework last month. She spent about 30% of this total time on math. About how many hours were spent on math?

Answers

Answer:     9.6


Step-by-step explanation: A percent is like a decimal so 15% would be 0.15 so if you use that for this you must multiply 32 hours by the 30%/0.30 to find the answer


The points are (-2,4) and (6,-1)

Answers

Answer: the slope is -5/8 so the mid point would be 2,1.5


Step-by-step explanation:


Answer:


Step-by-step explanation:

You are half way there when you record the endpoints from the graph correctly. Nice work.

The midpoint is found by this formula

(x_mid,y_mid) = (x1 + x2)/2 , (y1 + y2)/2

Givens

x1 = -2x2 = 6y1 = 4y2 = -1

Solution

(x_mid,y_mid) = (-2 + 6)/2, (4 + - 1)/2

(x_mid,y_mid) = (2, 1.5)  Answer

Graph


Mark cycled 25 miles at a rate of 10 mph how long did it take Mark two cycle 25 miles?

Answers

Answer:

2.5 hours

Step-by-step explanation:

25 miles/10 mph= 2.5 hours

Answer:

The awnser is 2.5 because,

Step-by-step explanation:

.25 divided by 10 = 2.5

The decimal moves one time to the left because there is ONE zero (0) in 10.

Eduardo piensa en un número entre 1 y 20 que tiene exactamente 5 factores. ¿En qué número está pensando?

Answers

Answer:

Hola,

1, 2, 4, 5, 10, 20

Step-by-step explanation:


He gets 25 Cash back

A community center is going on a trip to Philadelphia via several buses. The ratio of men to women to children is 1:2:3. If there are 150 people going on the trip, how many men are going? How many women are going? How many children are going? Show the steps you use to solve the problem

Answers

1x= men, 2x= women, 3x= children

1x+2x+3x=150.
6x=150
6x/6=150/6
x=30

1x=1×30=30 | 30 men
2x=2×30=60 | 60 women
3x=3×30=90 | 90 children
first have to identify the total ratio of the people going for the trip,and by that I mean you have to add 1,2 and 3.1+2+3=6
6=to the total ratio of people going for the trip.
men=1/6
women=2/6
children=3/6
6/6=150 people
1/6=?
1/6*150*6/6=25men.

6/6=150
2/6=?
2/6*150*6/6=50women.

6/6=150
3/6=?
3/6*150*6/6=75children

a factory makes parts for toys in different quantities,as shown in the table. how much would 11 parts costs

Answers

Based on the given table,  the cost for 11 parts would be approximately $4.95.

How to determine the cost for 11 parts

To determine the cost for 11 parts,  find the corresponding cost per part from the given table.

Let's analyze the given data:

Number of parts: 2, 7, 12, 15

Cost ($): 0.90, 3.15, 5.40, 6.75

We can observe that the cost per part increases as the number of parts increases.

To calculate the cost for 11 parts, interpolate between the quantities given in the table.

Using linear interpolation, find the cost for 11 parts as follows:

First,  determine the cost per part for 7 parts and 12 parts:

Cost for 7 parts = $3.15

Cost for 12 parts = $5.40

To find the cost for 11 parts, interpolate between these two values:

Cost for 11 parts ≈ Cost for 7 parts + [11 - 7] / [12 - 7] * (Cost for 12 parts - Cost for 7 parts)

Cost for 11 parts ≈ $3.15 + [11 - 7] / [12 - 7] * ($5.40 - $3.15)

Calculating this expression:

Cost for 11 parts ≈ $3.15 + 4/5 * ($5.40 - $3.15)

Cost for 11 parts ≈ $3.15 + 4/5 * $2.25

Cost for 11 parts ≈ $3.15 + $1.80

Cost for 11 parts ≈ $4.95

Therefore, the cost for 11 parts would be approximately $4.95.

A factory makes parts for toys in different quantities, as shown in the table. how much would 11 parts costs

number of parts: 2, 7, 12, 15

cost($): 0.90, 3.15, 5.40, 6.75

Azul orders 5 veggie pizzas for his birthday party.he orders enoghe for every one to eat 5/6 of the pizza hpw many people can he feed

Answers

Answer:

He can feed 5 people

Step-by-step explanation:

divide pizzas in the number of people to how much people will eat.

divide 5 by invisible number, x. getting the answer of 5/6

x=6

Answer:6

Step-by-step explanation:

PLS HELP ME NOW!! 55 POINTS!

Answers

Answer:

x=56

The exterior angle is 116

Step-by-step explanation:

The three angles of a triangle add to 180 degrees.

Lets call the unknown angle in the triangle y

y ,2x+4 make a straight line so they are supplementary.  That means they add together to make 180 degrees

y + 2x+4=180

Lets solve for y by subtracting 2x+4 from each side

y + 2x+4 - (2x+4) = 180 - (2x+4)

y = 180 -2x-4

y = 176 -2x


The three angles x , 60 and y   add together to make 180 degrees.

x + 60 + y = 180

Substituting in for y

x + 60 + 176 -2x = 180

Combine like terms

-x + 236 = 180

Subtract 236 from each side

-x+236-236 = 180-236

-x = -56

Divide by -1

x = 56

The exterior angle is 2x+4

2(56) +4

112+4

116

Answer: 1) x=56

2) value of the exterior angle: 116


Step-by-step explanation:

1. to solve for x, set up the equation that equals to the exterior angle

60 + x = 2x + 4

-x + 60 = 4

-x = -56

x = 56


2. now insert x (56) to the exterior angle expression

2 (56) + 4

112 + 4

116 degrees




Look at the figure shown below: A triangle RPQ is shown. S is a point on side PQ and T is a point on side PR. Points S and T are joined using a straight line. The length of PS is equal to 3x, the length of SQ is equal to 24, the length of PT is equal to 51 and the length of TR is equal to 34. Dora is writing statements as shown below to prove that if segment ST is parallel to segment RQ, then x = 12: Statement Reason 1. Segment ST is parallel to segment QR Given 2. Angle QRT is congruent to angle STP Corresponding angles formed by parallel lines and their transversal are congruent. 3. Angle SPT is congruent to angle QPR Reflexive property of angles. 4. Triangle SPT is similar to triangle QPR Angle-Angle Similarity Postulate 5. ? Corresponding sides of similar triangles are in proportion. Which equation can she use as statement 5? (3x + 24):3x = 85:51 (3x + 24):85 = 3x:51 (3x + 24):51 = 3x:85 34:24 = 3x:51

Answers

Answer:

(A)

Step-by-step explanation:

The Postulate states that corresponding sides of similar triangles are in proportion.

We know that similar triangles are the triangle which have congruent triangles and and the corresponding sides are in proportion

Now in ΔSTP and ΔRPQ, corresponding sides are : (RP,TP); (RQ,TS) ;  (PQ,PS)

So we have RP:TP = PQ:PS

TP= 51; RP= 85; PS = 3x; PQ = 3x+24

PQ : PS = RP : TP

3x+24 : 3x = 85 : 51

Hence 5 statement represents (A) equation

Answer: A) (3x + 24):3x = 85:51

A study revealed that most orchards that used a new fertilizer harvested peaches with multiple pits. However, orchards that did not use the new fertilizer did not harvest any peaches with multiple pits.
The most reasonable conclusion that can be made from the study is that the new fertilizer ___________

1. is associated with the growth of peaches with multiple pits but does not cause it
2.is not related to the growth of peaches with multiple pits
3.causes the growth of peaches with multiple pits
4.prevents the growth of peaches with multiple pits

Answers

Answer:

causes the growth of peaches with multiple pits

Step-by-step explanation:

I got a 100% on the test :)

Option 3 "causes the growth of peaches with multiple pits" is the correct answer.

What is a survey?

A survey is a means of gathering information from a sample of people using pertinent questions with the goal of understanding populations as a whole.

We have:

A study revealed that most orchards that used a new fertilizer harvested peaches with multiple pits.

In this study the cases are as follows:

Case 1: Adding fertilizer

The end result is that peaches are plucked while still full of pits.

Case 2: Leaving out fertilizer

As a result, no peaches are picked up with multiple pits.

Thus, option 3 "causes the growth of peaches with multiple pits" is the correct answer.

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really confused and am on final attempt!

Answers

Answer:

C

Step-by-step explanation:

the legs of a 30-60-90 triangle are 1 and [tex]\sqrt{3}[/tex], while the hypotenuse is 2.

the ratio of the legs is therefore 1 : [tex]\sqrt{3}[/tex] → C



5. Grayson a green number cube and a white number cube. the faces of the cubes are number 1 through 6. Graysen roll each cube one time. What is the probability that the green cube will land with an even number face up and the white cube will land with a number greater than 2 face up?
A.1/9
B.1/36
C.1/3
D.1/6

Answers

Answer: P(G even and W>2) = 1/3 or 0.333 or 33.3%


Step-by-step explanation:

Independent events multiply probabilities,

P(G even)=1/2, P(W>2)=2/3, P(G even and W>2)= 1/2 × 2/3 = 1/3.


Without using definition of "independent events", or rules referring to them, I use sample space S of 36 points, and P(event) = #(event)/#(sample space).

Points are labeled with two digits, left is green die, right is white die. S = {11,12,13,14,15,16,21,...26,...,61,...,66}, and #(S)=36.

An event E is a subset of S, and

0 <= #(E) <= #(S) = 36.

Event G even is GE={21,22,23...,41,42,...,61,...,66},

#(G even)=18

Event "W>2" = W2 ={13,14,15,16,23,24...,63,64,65,66},

#(W>2)=24.

Event G even and W>2 GEW2={23,24,25,26,43,44,45,46,63,64,65,66),

#(GEW2)=12

P(GEW2)=#(GEW2)/#(S)=12/36=1/3=33.3%



Final answer:

To find the probability of the green cube landing with an even number face up and the white cube landing with a number greater than 2 face up, multiply the probabilities of each event happening. The probability is 1/3.

Explanation:

To find the probability that the green cube will land with an even number face up and the white cube will land with a number greater than 2 face up, we need to determine the number of favorable outcomes and the total number of possible outcomes.

The green cube has 3 even numbers (2, 4, and 6) out of 6 faces, so the probability of the green cube landing with an even number face up is 3/6 or 1/2.

The white cube has 4 numbers greater than 2 (3, 4, 5, and 6) out of 6 faces, so the probability of the white cube landing with a number greater than 2 face up is 4/6 or 2/3.

To find the probability of both events happening, we multiply the probabilities: (1/2) * (2/3) = 1/3.

Therefore, the probability that the green cube will land with an even number face up and the white cube will land with a number greater than 2 face up is 1/3. Option C, 1/3, is the correct answer.

Factor the expression using the GCF.
21a squared b to the 5th power + 49a to the 4th power b cubed

Answers

[tex]21a^2b^5+49a^4b^3=(7a^2b^3)(3b^2)+(7a^2b^3)(7a^2)=7a^2b^3(3b^2+7a^2)[/tex]

The formula for the volume of a pyramid is V=1/3Bh. Which of the following equations is equivalent to the given formula?

A) B=3V/h

B) B=3h/V

C) B=V-1/3/h

D) B=V+1/3/h

Answers

A) B=3V/h

Multiply both sides by 3 to get 3V=Bh. Divide both sides by h, and you get 3V/h=B

Answer:

A) B = 3V/h

Step-by-step explanation:

Given: The formula for the volume of a pyramid is V=1/3Bh.

From the above equation, we have to solve for B.

We use inverse operation to find B.

Multiply by reciprocal of 1/3 on both sides. the reciprocal of 1/3 is 3.

So, multiply by 3 on both sides, we get

3V = 3*1/3*B*h

3V = B*h

Now divide both sides by h, we get

3V/h = Bh/h

3V/h = B

Therefore, the answer is A) B = 3V/h

What is the apparent solution to the system of equations? y=−x+2y=4x+7 Graph the system of equations using the Line tool. Plot a point at the apparent solution to the system using the Point tool

Answers

Answer:

Given the system of equation:

[tex]y = -x + 2[/tex] and

[tex]y =4x+7[/tex]

Table for the equation [tex]y = -x + 2[/tex] ;

x                y

-1               -3

0              2

1                1

2               0

Then, the points for this equations are: (-1, -3), (0, 2) , (1, 1 ) and (2, 0)

Also, table for the equation: [tex]y =4x+7[/tex]

x               y

-1.75         0  

-1              3

0              7

1               11

Then, the points for this equations are: (-1.75, 0) , (-1, 3) , (0, 7) and ( 1, 11)

Using Point tool , we plot these points of the given system of equation on the Cartesian plane.

You can see the graph as shown below in the attachment.

Also, the two lines intersects at (-1, 3)      

Therefore, the apparent solution for the given system of equation is; (-1, 3)

Final answer:

To find the apparent solution to the system of equations, you need to solve the equations simultaneously. The apparent solution to the given system of equations is (-1, 3).

Explanation:

To find the apparent solution to the system of equations, we need to solve the equations simultaneously. The given equations are:

y = -x + 2

y = 4x + 7

We can solve these equations by setting them equal to each other:

-x + 2 = 4x + 7

Now, we can solve for x:

-x - 4x = 7 - 2

-5x = 5

x = -1

Substituting this value of x back into either of the original equations, we can find the corresponding value of y:

y = -(-1) + 2

y = 3

Therefore, the apparent solution to the system of equations is (-1, 3).

What is 1.67 × 104 in standard form?
A) 1,670,000
B) 16,700
C) 0.1670
D) 0.0167

Answers

Answer:

B is the answer

Step-by-step explanation: B is the answer because 10^4 is 10*10*10*10 which is 10000 so 10000 times 1.67 is 16700


Which models can be used to solve the problem

Answers

Answer:

The answer is C. 0.60b + 0.30w = 150; 60 + 0.30w = 150

Step-by-step explanation:


Add 4 yards 2 feet 8 inches, 3 feet 11 inches and 6 yards 6 feet and 6 inches

Answers

Yards: 4+6
Feet: 2+3+6
Inches: 8+11+6

So the total is 10 yards, 11 feet, and 25 inches. There are 12 inches in a foot so 25 inches is actually 2 feet and 1 inch. So now there are 13 feet in total.

There are 3 feet in every yard, so 13 feet can be rewritten as 4 yards and 1 foot. So in total there are 10+4 yards, 1 foot, and 1 inch.

Answer: 14 yards, 1 foot, and 1 inch.
Final answer:

The sum of 4 yards 2 feet 8 inches, 3 feet 11 inches and 6 yards 6 feet and 6 inches is 11 yards and 1 foot or 11 1/3 yards and 7 inches, using standard conversions between inches, feet, and yards.

Explanation:

To solve this problem, we first need to recall the relationships between inches, feet, and yards. There are 12 inches in a foot, and 3 feet in a yard.

Starting with the yards, you have 4 yards plus 6 yards giving you a total of 10 yards. Moving on to feet, you have 2 feet from the first measurement, and 6 feet from the third measurement. Also, remember to convert the 3 feet in the second measurement into 1 yard and add it to your yards total, which makes 11 yards and leaves you with no feet. For inches, add 8 inches from the first measurement and 11 inches from the second measurement for a total of 19 inches.

Then, convert these measurements to the highest unit possible. Your 19 inches equals 1 foot and 7 inches. Add this foot to your feet total and you have 1 feet and 11 yards. Finally, convert feet to yards: 1 foot is 1/3 of a yard, so you finish with a total of 11 1/3 yards and 7 inches.

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list the integers that satisfy both these inequalities.

2x + 9 < 0

x > -12

put the answers on one line.

Answers

Answer: -12 < x < [tex]-\frac{9}{2}[/tex]

Step-by-step explanation:

2x + 9 < 0    and      x > -12

2x       < -9

 x        < [tex]-\frac{9}{2}[/tex]


Since it is an "and" statement, x is between -12 and [tex]-\frac{9}{2}[/tex], so -12 < x < [tex]-\frac{9}{2}[/tex]

Graph: -12 o-----------------o [tex]-\frac{9}{2}[/tex]

Interval Notation: (-12, [tex]-\frac{9}{2}[/tex])

The integers that satisfy the inequalities 2x + 9 < 0 and x > -12 are -11, -10, -9, -8, -7, -6, and -5.

To find integers that satisfy both inequalities 2x + 9 < 0 and x > -12, we first solve each inequality separately.

For the inequality 2x + 9 < 0, we subtract 9 from each side to get 2x < -9. Then we divide each side by 2 to find x < -4.5. Since we are looking for integers, x must be less than or equal to -5.

For the inequality x > -12, since x must be greater than -12 and is an integer, the least integer x can be is -11.

Putting these together, the integers that satisfy both inequalities are the set of all integers from -11 through -5. Therefore, we list the integers on one line as: -11, -10, -9, -8, -7, -6, -5.

Area of a rectangle is 540 sq m. If the length was reduced by 5m and the width was increased by 5m, the are of the rectangle will be increased 35 sq m. Calculate the length and the width of the first rectangle

Answers

[tex]l-length\\w-width\\\\\text{The formula of an area of a rectangle:}\ V=lw\\\\\text{We have the area}\ 540\ m^2\to lw=540\\\\\text{New rectangle}\\\\l-5-length\\w+5-width\\\\\text{We have the area}\ 540\ m^2+35\ m^2=575\ m^2\to (l-5)(w+5)=575\\\\\text{Therefore we have the system of equation:}\\\\\left\{\begin{array}{ccc}lw=540&\to w=\dfrac{540}{l}&(*)\\(l-5)(w+5)=575&&(**)\end{array}\right\\\\\text{Substitute}\ (*)\ \text{to}\ (**)[/tex]

[tex](l-5)\left(\dfrac{540}{l}+5\right)=575\qquad\text{use distributive property}\\\\(l)\left(\dfrac{540}{l}\right)+(5)(l)-(5)\left(\dfrac{540}{l}\right)-(5)(5)=575\\\\540+5l-\dfrac{2700}{l}-25=575\\\\515+5l-\dfrac{2700}{l}=575\qquad\text{subtract 575 from both sides}\\\\-60+5l-\dfrac{2700}{l}=0\qquad\text{multiply both sides by }\ l\neq0\\\\-60l+5l^2-2700=0\\\\5l^2-60l-2700=0\qquad\text{divide both sides by 5}\\\\l^2-12l-540=0\\\\l^2+30l-18l-540=0\\\\l(l+30)-18(l+30)=0\\\\(l+30)(l-18)=0\iff l+30=0\ \vee\ l-18=0\\\\l=-30<0\ \vee\ \boxed{l=18\ cm}[/tex]

[tex]\text{Substitute the value of}\ l\ \text{to}\ (*):\\\\w=\dfrac{540}{18}\\\\\boxed{w=30\ cm}[/tex]

[tex]Answer:\ \boxed{length=18\ cm,\ width=30\ cm}[/tex]

The original dimensions of the rectangle are 30 meters in length and 18 meters in width.

We need to find the dimensions of the original rectangle given an area of 540 sq m and the changes in area after altering the dimensions. Let's represent the length of the rectangle as L meters and the width as W meters.

From the information provided:
Original Area: L * W = 540
New Area: (L - 5) * (W + 5) = 540 + 35

By solving these equations step-by-step:

L  * W = 540

(L - 5)(W + 5) = 575
LW + 5L - 5W - 25 = 575
LW - 5(W - L) - 25 = 575
Substitute the original area (LW = 540):
540 - 5(W - L) - 25 = 575
-5(W - L) = 60
W - L = -12

Now we have two simultaneous equations:
L * W = 540
W - L = -12

We can solve these equations for L and W.

Solving the system of equations, we get:

L = 30 meters
W = 18 meters

Therefore, the original dimensions of the rectangle are 30 meters in length and 18 meters in width.

An item has a listed price of $45.If the sales tax rate is 5%,how much is the sales tax (in dollars)?

Answers

Answer:

sales tax = 2.25

Step-by-step explanation:

To find the sales tax, we multiply the list price by the tax rate

We need to convert the tax rate of 5% to decimal form 5% = .05

sales tax = 45 * .05

sales tax = 2.25

A rectangular school banner has a length of 40 inches and a width of 24 inches. A sign is made that is similar to the school banner and has a length of 18 inches. What is the ratio of the area of the school banner to the area of the sign?

Answers

Final answer:

The area of the school banner is approximately 5 times larger than the sign. Area was calculated by multiplying length by width for each, then the ratio was found by dividing the banner area by the sign area.

Explanation:

The subject of this question is mathematics, mostly involving geometrical comparison and proportions between squares. First, you would need to calculate the area of both the banner and the sign. The area of a rectangle is calculated by multiplying its length by its width, so the areas would be 40 inches x 24 inches = 960 square inches for the banner and, the sign would have similar proportions, so width = 18 inches x (24/40) = 10.8 inches, so the area of the sign would be 18 inches x 10.8 inches = 194.4 square inches. Finally, the ratio of the area of the school banner to the area of the sign would be 960/194.4 = 4.94 (approximately). This means the banner is about 5 times larger than the sign.

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You purchase a $220 airline ticket. You have a discount code to receive 10% off. There is a 10.5% service charge added to the total. How much do you pay for your ticket?

The only three options for answers are $231, $218.79, and $198

Answers

$198?? Has to be the answer if wrong let me jnow

what is a number that is less that -2 4/5 and greater that -3 1/5?

Answers

Answer:

-3

Step-by-step explanation:

hm this is a  little tricky!

so on a number line, -3 will be behind -2 because it is less than the two since it is negative. If we have 4/5 and 1/5 we will need to think what comes between them.

5/5 and 0/5  

which means that -3 comes between them both

First and foremost, notice that because the two integers are negative,  [tex]- 2\frac{4}{5}[/tex] is greater than the other number [tex]-3 \frac{1}{5}[/tex] .  As just a result, a number less than  [tex]- 2\frac{4}{5}= -\frac{14}{5}[/tex] and greater than [tex]- 3 \frac{1}{5}= -\frac{16}{5}[/tex]  means a value between such two integers.

There could be an infinite amount of integers between any two such values. If we have two numbers a and b, then an integer [tex]\frac{ma+nb}{m + n}[/tex]  where m and n are any two positive numbers exists between a and b, then we'll have a unlimited number of such number by picking a variety of m and n.Let us choose, [tex]m = 1 \ \ and\ \ n = 1[/tex] this number is [tex]\frac{a+b}{2}.[/tex] That's what we [tex]a= -\frac{14}{5}\ \ and\ \ b = -\frac{16}{5}[/tex] currently possess[tex]= \frac{-\frac{14}{5} -\frac{16}{5}}{2} =-\frac{30}{5} \times \frac{1}{2} = -\frac{15}{5}=-3[/tex] . Since [tex]\frac{ma+nb}{m + n}[/tex] all numbers m, n, a, and b are rational numbers, [tex]\frac{ma+nb}{m + n}[/tex] would only return rational numbers between a and b. In reality, there might be infinite irrational numbers between a and b which is [tex](a^m. b^n)^{\frac{1}{m+n}}[/tex].

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Mrs. Nelson is buying folding chairs that are on sale for $10. if she has $50, which inequality can be solved to show the number of chairs c she can buy?

A.) 10c≤50
B.) 10c≥50
C.) 10c>50
D.) 10c<50

Answers

Answer:

A.) 10c≤50

Step-by-step explanation:

This inequality shows less than or equal to 10 chairs can be bought with $50

Answer: A.) 10c≤50

Step-by-step explanation:

Hi, to answer this question we have to write an inequality using the information given:

Mrs. Nelson is buying folding chairs that are on sale for $10.  

So, if the number of chairs is "c", we can multiply "c" by $10 to obtain the cost of buying "c" number of chairs.

She only has $50, so, the cost of the chairs must be less or equal to 50.

Mathematically speaking:

10c≤50  (option A)

Feel free to ask for more if needed or if you did not understand something.  


12. A pack of cinnamon-scented pencils sells for $4.00. What is the sales tax rate if the total cost of the pencils is $4.32?
13. How can you solve problems involving percents?

Answers

Answer:

12) tax rate is 8%

13) convert percent to decimal format

Step-by-step explanation:

12)   4.32/4.00 = 1.08

1.08 - 1 = 0.08

0.08 * 100 = 8%


13) Convert all % to decimal format.

Do this by dividing the percent by 100

e.g. 10% = 10/100 = 0.10


You can walk 1 3/4 miles in 1/2 hour. What’s your average speed?

Answers

Answer:

avg speed is 3.5 miles per hour

Step-by-step explanation:

1.75 x 2 = 3.5 miles per hour

Answer:

3 and 1/2

Step-by-step explanation:

hope this helps

Twenty-five subtracted from one-half a number is 10.What is the number?

Answers

Answer:

70

Step-by-step explanation:

The simplest way to find the number is work backwards. If you know the final answer is 10, start with 10 and make the number x. Then set up the original equation.

0.5x-25=10

Then start working backwards(isolate).

0.5x-25=10

      +25  +25

in other words, 10+25=0.5x. (the 25 cancels out because -25+25=0)

10+25=35, so 35=0.5x.

Now, instead of dividing by 2, multiply by 2(opposite again).

35=0.5x

/0.5(aka *2)     /0.5(cancels out)

now you are left with 70=x, so the number is 70.

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