Can someone help me?

Answer:

Option A is correct answer.

Step-by-step explanation:

An equation is having two sides equal. It has an = sign in it.

So, Option A 2y+7 = 9 is an equation as it has = sign in it. So, it is correct option.

All other options do not have = sign in them so, they are not equations.

ANSWER

The fifth term is 27

EXPLANATION

The explicit rule for the given sequence is

[tex]t_n= {2}^{n} - n[/tex]

To find the fifth term, we substitute n=5 to get,

[tex]t_5= {2}^{5} - 5[/tex]

[tex]t_5= 32 - 5[/tex]

Simplify:

[tex]t_5= 27[/tex]

The fifth term is 27

Answer:

(31zy)/(13xz)

Step-by-step explanation:

A reciprocal is a number that you can multiply the original number by and get a product of 1. To find the reciprocal of a fraction, flip it upside down, putting the numerator in the denominator, and the denominator in the numerator:

[tex]\frac{31zy}{13xz}[/tex]

If we multiply this fraction by the other, we would end up simplifying it to 1 by cross multiplication.

Answer: x=-4,3+5x; 3,-5x

step-by-step explanation: I just used ,athway. this is what is told me. i hope this helps

Answer:

$7,542

Step-by-step explanation:

Her commission is 6% of $125,700.

To find a percent of a number, multiply the percent by the number. Change the percent to a decimal by dividing the percent by 100.

6% of $125,700 =

= 6% * $125,700

= 0.06 * $125,700

= $7,542

Answer:chicken nuggie

Step-by-step explanation:

Answer:

C. 14,871.21

Step-by-step explanation: You take the number 29,742.42 and multiply it by .2 to get how much they spend on food (5,948.48), and you multiply the same number by .3 to get how much they spend on housing (8,922.73). Then, you add them up to get the total. .2 is acctually 20% of what they spend out of the 29,742.42 and the same for the .3. Hope this wasn't too complicated by the way I explained it.

Answer:

The solution of the two equations is (-1 , -3)

Step-by-step explanation:

* Lets revise how to solve the system of the linear equations

- We have two ways to do that

# Substitution method

# Elimination method

- Substitution method is to find one variable in terms of the other

  variable from one of the two equations, then substitute this value

  in the second equation

* Lets solve the problem by the substitution method

∵ x + y = -4 ⇒ (1)

∵ y = 2x - 1 ⇒ (2)

- In equation (2) we have y in terms of x

∴ Substitute (2) in (1)

∴ x + (2x - 1) = -4 ⇒ simplify ir

∴ x + 2x - 1 = -4 ⇒ add the like terms

∴ 3x - 1 = -4 ⇒ add 1 to both sides

∴ 3x = -3 ⇒ divide both sides by 3

∴ x = -1

- Substitute the value of x in equation (2)

∴ y = 2(-1) - 1 = -2 - 1 = -3

∴ The solution of the two equations is (-1 , -3)

* Lets check the answer

- Substitute the value of x-coordinate and y-coordinate in equation (1)

∵ The left hand side = (-1) + (-3) = -4

∵ The right hand side = -4

∴ The two sides equal each other

∴ (-1 , -3) is a solution of the equation x + y = -4

* Lets do the same in the second equation

∵ The left hand side = -3

∵ The right hand side = 2(-1) - 1 = -2 -1 = -3

∴ The two sides equal each other

∴ (-1 , -3) is a solution of the equation y =2x - 1

∴ (-1 , -3) is the solution of the two equations

Answer:

10 cms.

Step-by-step explanation:

The circumcircle passes through each vertex of the hexagon so the radius is  equal to one of the  2 equal sides of an isosceles triangle with base = 10 cm and vertex = 60 degrees.

So considering this triangle  the base angles are ( 180 - 60) / 2 = 60 degrees.  So we have an equilateral triangle with each side = 10 cm.

Therefore the  radius is 10 cm. long.

The radius of the circumcircle of the regular hexagon is approximately 5.77 cm.

In a regular hexagon:

- Each side length  s = 10 cm.

- The circumcircle passes through all vertices of the hexagon, making it the circle that circumscribes the hexagon.

The radius R of the circumcircle of a regular hexagon can be related to its side length s by the formula:

[tex]\[ R = \frac{s}{\sqrt{3}} \][/tex]

Let's apply this formula:

[tex]\[ R = \frac{10}{\sqrt{3}} \][/tex]

To simplify [tex]\( \frac{10}{\sqrt{3}} \)[/tex], multiply the numerator and the denominator by [tex]\( \sqrt{3} \)[/tex]

[tex]\[ R = \frac{10 \cdot \sqrt{3}}{3} \][/tex]

Therefore, the radius of the circumcircle of the regular hexagon with a side length of 10 cm is [tex]\( \frac{10 \sqrt{3}}{3} \)[/tex] cm. This is the exact value of the radius in terms of [tex]\( \sqrt{3} \)[/tex]. If you need a numerical approximation, you can calculate it as follows:

[tex]\[ R \approx \frac{10 \times 1.732}{3} \approx \frac{17.32}{3} \approx 5.77 \text{ cm} \][/tex]

Step by step explanation:

You first subtract z on both sides of the equal sign

ax-bx=(z-y)

Since a and b both have a "x" you can subtract them

(a-b)x=(z-y)

then you divide "x" on both sides of the equal sign

[tex]\frac{a - b}{x} = \: \frac{z - y}{x} [/tex]

To find x in the equation ax-bx+y=z, combine like terms, subtract y from both sides, and then divide by (a-b) to get the formula x = (z-y)/(a-b).

To find the value of x in the equation ax - bx + y = z, you can follow these steps:

This step-by-step process allows you to solve for x in terms of a, b, y, and z.

Answer:

it would be in a decimal 2.6

Step-by-step explanation:

Answer:1/3

Step-by-step explanation:

1/6 × 2/1 =1/3

Cross multiply 6÷2 =3

Answer: [tex]-2<x<3[/tex]

Step-by-step explanation:

You need to set up two cases (Positive case and negative case) and solve for "x".

- POSITIVE CASE IF: [tex]2x-1>0[/tex]

[tex]9(2x -1) + 4 < 49\\18x-9<49-4\\18x<54\\x<3[/tex]

- NEGATIVE CASE IF: [tex]2x-1<0[/tex]

[tex]-9(2x -1) + 4 < 49\\-18x+9<49-4\\-18x<36\\x>-2[/tex]

Therefore, the solution is:

[tex]-2<x<3[/tex]

Answer:

see explanation

Step-by-step explanation:

Given

9 | 2x - 1 | + 4 < 49 ( subtract 4 from both sides )

9 | 2x - 1 | < 45 ( divide both sides by 9 )

| 2x - 1 | < 5

Inequalities of the type | x | < a always have solutions of the form

- a < x < a, thus

- 5 < 2x - 1 < 5 ( add 1 to all 3 intervals )

- 4 < 2x < 6 ( divide all 3 intervals by 2 )

- 2 < x < 3

Answer:

The correct answer option is B. equal.

Step-by-step explanation:

In a symmetrical distribution the mean, median, and mode are equal.

In any distribution which is symmetric, half of its curve is the mirror image of the other half. The pull remains same on each side and the frequencies are also symmetrically distributed.

Therefore, mean, median and mode all fall at the middle as one side balances the other sides.

Answer:

B) EQUAL

Hope this hels

Answer:

-95

Step-by-step explanation:

234+112-56+38-423

Answer:

$3

Step-by-step explanation:

Whenever some type of expenditure is made, there are usually 2 types of costs available: the fixed cost and the variable cost. Former is the constant cost which has to be incurred in order to gain the advantage from the expense. Latter is the cost that varies with the duration of the expense. Therefore, total costs (TC) = fixed costs (FC) + variable costs (VC). VC can be expressed as: VC = price per hour (p) * number of hours (h). So the equation becomes TC = FC + p*h. In this question, FC = $43, TC = $64, h = 7 hours, and p is unknown. So plugging in the values give:

64 = 43 + 7p.

Solving the equation for p gives:

p = 21/7. This implies that p = 3.

Therefore, the hourly fee is $3!!!

Answer:

7h+43=64

$3 the hourly fee for the rototiller

Step-by-step explanation:

Answer:

c

Step-by-step explanation:

B) a parabola

SHSJDKD

The graph of y = 3/4 - 7/8 will end up being a straight line. The line will be horizontal and cross the y axis at approximately (0,1).

Answer:76 and 84

Step-by-step explanation:

Answer:

1) 78 and 82

2)76 and 84

3)74 and 86

Step-by-step explanation:

1)

Given

mean, x= 80

standard deviation, sd= 2

given percentage of class= 68%

now as per the properties of normal distribution:

-68% of the scores will lie within one standard deviation, sd of the mean, x

i.e. between x-sd and x+sd

Putting values in above we get:

x-sd= 80-2 = 78

x+sd=80+2= 82

Hence about 68% of the class would score between 78 and 82

2)Given

mean, x= 80

standard deviation, sd= 2

given percentage of class= 95%

now as per the properties of normal distribution:

-95% of the scores will lie within 2 standard deviation, sd of the mean, x

i.e. between x-2sd and x+2sd

Putting values in above we get:

x-sd= 80-2(2) = 80-4 = 76

x+sd=80+2(2)= 80+4 = 84

Hence about 95% of the class would score between 76 and 84

3)Given

mean, x= 80

standard deviation, sd= 2

given percentage of class= 99%

now as per the properties of normal distribution:

-99% of the scores will lie within 3 standard deviation, sd of the mean, x

i.e. between x-sd and x+sd

Putting values in above we get:

x-sd= 80-3(2) = 80-6 = 74

x+sd=80+3(2)= 80+6 = 86

Hence about 99% of the class would score between 74 and 86!

Check the picture below.

By the law of sines,

[tex]\dfrac{\sin\angle A}a=\dfrac{\sin\angle B}b=\dfrac{\sin\angle C}c[/tex]

The interior angles of any triangle sum to 180 degrees in measure, so we know

[tex]m\angle A=(180-85-40)^\circ=55^\circ[/tex]

Then

[tex]\dfrac{\sin55^\circ}a=\dfrac{\sin85^\circ}{26}\implies a\approx21[/tex]

and

[tex]\dfrac{40^\circ}c=\dfrac{\sin85^\circ}{26}\implies c\approx17[/tex]

Answer:

The average rate of change from x= 7 to x=10 is 14

Step-by-step explanation:

We can use the slope formula to find the average rate of change

[tex]m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}[/tex]

Now, we are given f(x) = x^2-3x-4 and x=7 to x=10

Our formula can be rewritten as:

[tex]m=\frac{f(10)-f(7)}{10-7}[/tex]

finding f(10) = (10)^2 -3(10) -4

                   = 100 -30 -4

                   = 66

and f(7) = (7)^2 -3(7) -4

            = 49-21-4

            = 24

Now finding m:

m= 66 - 24 / 10-7

m= 42/3

m= 14

So, the average rate of change from x= 7 to x=10 is 14.

ANSWER

[tex]14[/tex]

EXPLANATION

The given function is

[tex]f(x) = {x}^{2} - 3x - 4[/tex]

The average rate of change from x=7 to x=10 is given by;

[tex] \frac{f(10) - f(7)}{10 - 7} [/tex]

[tex]f(10) = {(10)}^{2} - 3(10) - 4[/tex]

[tex]f(10) = 100 - 30 - 4[/tex]

[tex]f(10) = 66[/tex]

[tex]f(7) = {7}^{2} - 3(7) - 4[/tex]

[tex]f(7) = 49 - 21- 4 = 24[/tex]

The average rate of change now becomes:

[tex] \frac{26 - 24}{3} = \frac{52}{3} =14[/tex]

Answer:

maximum at (4, 9)

Step-by-step explanation:

The equation of a parabola in vertex form is

y = a(x - h)² + k

where (h, k) are the coordinates of the vertex and a is a multiplier

y = - 1(x - 4)² + 9 is in this form

with vertex = (4, 9)

• If a > 1 then vertex is a minimum

• If a < 0 then vertex is a maximum

here a = - 1 , hence vertex (4, 9) is a maximum

Answer:

12

Step-by-step explanation:

You could actually list the numbers between (but not including) 45 and 58:

{46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57}.  I count 12 numbers here.

A number is an arithmetic value that is used to represent a quantity and calculate it. The number of natural numbers between 58 and 45 are 12.

A number is an arithmetic value that is used to represent a quantity and calculate it. Numericals are written symbols that represent numbers, such as "3."

The number of natural numbers between any two natural numbers is given by the (n₂-n₁-1), where the two of the numbers are not included. Also, n₂ and n₁ represent the two natural numbers.

As it is needed to be found the natural number is between 45 and 58, the value of n₂ is 58, while the value of n₁ is 45. Therefore,

The number of natural numbers = (n₂-n₁-1) = (58-45-1) = 12

Hence, the number of natural numbers between 58 and 45 are 12.

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Answer:

The correct answer is A, 73

Step-by-step explanation:

First we have to arrange the whole numbers in ascending order. i-e from smallest to largest. Showing it as follows:

53 54 59 62 64 65 66 68 70 71 75 78 79 79 83 83 86 90 91 94                

Now we would find the median by taking the middle number. But this series consists of even numbers. There are 20 numbers. So we will take the middle two numbers and find their average like follows:

71 + 75 = 146/2  = 73

The answer is 73

Answer:

median =73

Step-by-step explanation:

Given list of data is

{94,79,83,78,70,66,68,75,53,54.79,59,83,91,64,65,71,62,86,90}.

Now we need to find about what is the median for the data listed above.

So first we need to rearrange the given data in increasing order. then we can easily find the middle number as median.

Sorted list of data is:

{53, 54, 59, 62, 64, 65, 66, 68, 70, 71, 75, 78, 79, 79, 83, 83, 86, 90, 91, 94}

there are two numbers at the middle 71 and 75

then median = (71+75)/2=146/2=73

Hope this is what you need

Answer:

I am not sure of the equation but I interpreted it as x^2a^2+3xa^2+2a^2

Step-by-step explanation:

X^2a^2+3xa^2+2a^2

1. a^2 (x^2+3x+2)

2.a^2(x^2+2x+x+2)

3. a^2(x(x+2)+x+2)

4. a^2(x+2)(x+1)

Step-by-step explanation:

[tex]\bold{40.}\\\\A+B=\left[\begin{array}{ccc}3&1\\5&7\end{array}\right] +\left[\begin{array}{ccc}4&1\\6&0\end{array}\right] =\left[\begin{array}{ccc}3+4&1+1\\5+6&7+0\end{array}\right]=\left[\begin{array}{ccc}7&1\\11&7\end{array}\right][/tex]

[tex]\bold{41.}\\\\B-A=\left[\begin{array}{ccc}4&1\\6&0\end{array}\right]-\left[\begin{array}{ccc}3&1\\5&7\end{array}\right]=\left[\begin{array}{ccc}4-3&1-1\\6-5&0-7\end{array}\right]=\left[\begin{array}{ccc}1&0\\1&-7\end{array}\right][/tex]

[tex]\bold{42.}\\\\3C=3\left[\begin{array}{ccc}-2&3&1\\-1&0&4\end{array}\right]=\left[\begin{array}{ccc}(3)(-2)&(3)(3)&(3)(1)\\(3)(-1)&(3)(0)&(3)(4)\end{array}\right]=\left[\begin{array}{ccc}-6&9&3\\-3&0&12\end{array}\right][/tex]

[tex]\bold{43.}\\\\CD=\left[\begin{array}{ccc}-2&3&1\\-1&0&4\end{array}\right]\left[\begin{array}{ccc}-2&3&4\\0&-2&1\\3&4&-1\end{array}\right]\\\\=\left[\begin{array}{ccc}(-2)(-2)+(3)(0)+(1)(3)&(-2)(3)+(3)(-2)+(1)(4)&(-2)(4)+(3)(1)+(1)(-1)\\(-1)(-2)+(0)(0)+(4)(3)&(-1)(3)+(0)(-2)+(4)(4)&(-1)(4)+(0)(1)+(4)(-1)\end{array}\right]\\\\=\left[\begin{array}{ccc}4+0+1&-6-6+4&-8+3-1\\2+0+12&-3+0+16&-4+0-4\end{array}\right]\\\\=\left[\begin{array}{ccc}5&-8&-6\\14&13&-8\end{array}\right][/tex]

[tex]\bold{44.}\\\\2D+3C=2\left[\begin{array}{ccc}-2&3&4\\0&-2&1\\3&4&-1\end{array}\right]+3\left[\begin{array}{ccc}-2&3&1\\-1&0&4\end{array}\right]\\\\=\left[\begin{array}{ccc}(2)(-2)&(2)(3)&(2)(4)\\(2)(0)&(2)(-2)&(2)(1)\\(2)(3)&(2)(4)&(2)(-1)\end{array}\right]+\left[\begin{array}{ccc}(3)(-2)&(3)(3)&(3)(1)\\(3)(-1)&(3)(0)&(3)(4)\end{array}\right]\\\\=\left[\begin{array}{ccc}-4&6&8\\0&-4&2\\6&8&-2\end{array}\right]+\left[\begin{array}{ccc}-6&9&3\\-3&0&12\end{array}\right][/tex]

[tex]\large\bold{You\ can\ not\ add\ matrices\ of\ different\ dimensions!!!}[/tex]

Answer: square rectangle and Rhombus  trapezoid

Step-by-step explanation:

Answer:

square rectangle and Rhombus  trapezoid

Step-by-step explanation:

Answer:

9,18, and 36

Step-by-step explanation:

9*4=36 and 9*1=9

18*2=36 and 9*2=18

36*1=36 and 9*4=36

Answer:

multiples of 9: 9, 18, 27, 36, 45, 54, 63,72, 81, 90, 99, 108, etc.

factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36

Step-by-step explanation:

Answer:

option b) cos 240 degrees.

Step-by-step explanation:

This means that the expression cos 120 degrees can also be written as cos 240 degrees.

This because cos 240 degrees = -1/2 = cos 120 degrees.

This happens because the second and third quadrants carry the same signs.

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The cos240 degree is equal to cos120 degree because they both have same value which is -1/2

Trigonometry is a branch of mathematics that deals with the relationship between sides and angles of a right-angle triangle.

We have a:

= cos120°

The value of the cos120 is -1/2

= cos(90+30)

= -sin30

= -1/2

The value of cos240

cos240 = cos(180+60)  = -cos60 = 1/2

cos120° =  cos240°

Thus, the cos240 degree is equal to cos120 degree because they both have same value which is -1/2

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Answer:

Slope = -b/a.

Step-by-step explanation:

Note that the relation between 2/3 and -3/2 is that their product is -1.

If the slope is a/b then we have a/b * m = -1 where m is the slope of the perpendicular line .

So m =  -1 / a/b

= -b/a.

The produce = a/b * -b/a = -1.