Evaluate the expression below when x = -1.

2x2 − 5

x + 9

-7

8


-3

8


-1

8

-1

Answers

Answer 1
in this case, all you need to do is plug in -1 in place of x so
-1+9 is 8
the second to last choice is the correct solution.
Answer 2

Answer:

-3/8

Step-by-step explanation:

plato


Related Questions

If x represent a number , then write an expression for one half the sum of x and 7

Answers

Hello there!

It would be (x + 7) / 2

Hope This Helps You!
Good Luck :)

the sum of x and 7 would be x+7

 then to get half of that you would divide by 2

 so equation is (x+7)/2

There is 6/8 of a birthday cake leftover after a birthday party. How many 1/4 pieces can be made from the leftover cake?

Answers

divide both 6 & 8 by 2 6/2 = 3

8/2 = 4

so 6/8  = 3/4

 there is 3 pieces


???????????????????????????

Answers

y=×+8
×+×+8=10
×=1
y=9
(X.Y)(1.9)

An arithmetic sequence with a thrid term of 8 and constant difference of 5

Answers

[tex]\bf n^{th}\textit{ term of an arithmetic sequence}\\\\ a_n=a_1+(n-1)d\qquad \begin{cases} n=n^{th}\ term\\ a_1=\textit{first term's value}\\ d=\textit{common difference}\\ ----------\\ d=5\\ a_3=8\\ n=3 \end{cases} \\\\\\ a_3=a_1+(3-1)5\implies 8=a_1+(2)5\implies 8=a_1+10 \\\\\\ \boxed{-2=a_1} \\\\\\ a_n=-2+(n-1)5[/tex]

The total cost CC (in dollars) to participate in a ski club is given by the literal equation C=85x+60C=85x+60, where xx is the number of ski trips you take
How many ski trips do you take if you spend a total of $315? $485?

Answers

First of all why is there 2 similar equation connected to one another?

Second in order to solve this all you need to do is plug in the number and solve for x

For 485

85x+60=485
85x=420
X=5

Do the same thing and you get 3

Answer:

The total cost C (in dollars) to participate in a ski club is given by the literal equation :

[tex]C=85x+60[/tex]

Where x is the number of ski trips you take.

1. When C = 315 ;substituting the value of C in the above equation.

[tex]315=85x+60[/tex]

=> [tex]85x=315-60[/tex]

=> [tex]85x=255[/tex]

x = 3 trips.

2. When C = 485

[tex]485=85x+60[/tex]

=> [tex]85x=485-60[/tex]

=> [tex]85x=425[/tex]

x = 5 trips.

Stan and hilda can mow the lawn in 35 min if they work together. if hilda works twice as fast as stan, how long would it take stan to mow the lawn alone?

Answers

105 minutes "Stan and Hilda can mow the lawn in 35 min" 35 = 1/(S + H) "Hilda works twice as fast as Stan" H = 2S "how long would it take Stan to mow the lawn alone?" T = 1/S First, let's determine what S is, so 35 = 1/(S + H) Substitute 2S for H 35 = 1/(S + 2S) Solve for S 35 = 1/(3S) 35(3S) = 1) 105S = 1 S = 1/105 Now solve T = 1/S with S = 1/105 T = 1/S T = 1/(1/105) T = 1/1 / 1/105 T = 1/1 * 105/1 T = 105 So it will take Stan 105 minutes to mow the lawn alone.

The Kendal Company manufactures automobile engine parts. Running the manufacturing operations requires 12 watts (units of electricity per hour). The amount of electricity required to run the manufacturing operations and lighting the facility is given by y = 12x + 24, where x is the number of hours of manufacturing and y is the amount of electricity expended. How much electricity is used on a day when no parts are manufactured? (x 0, y 0)

Answers

The answer is 24 Watts.

Answer:

The answer is 24 watts.

Step-by-step explanation:

Running the manufacturing operations requires 12 watts (units of electricity per hour).

The amount of electricity required to run the manufacturing operations and lighting the facility is given by [tex]y=12x+24[/tex]

Here x is the number of hours of manufacturing and y is the amount of electricity expended.

When there are no parts manufactured, then x = 0

[tex]y=12(0)+24[/tex] = 24.

In winter, the price of apples suddenly went up by \$0.75$0.75dollar sign, 0, point, 75 per pound. Sam bought 333 pounds of apples at the new price for a total of \$5.88$5.88dollar sign, 5, point, 88.
Write an equation to determine the original price per pound (p)(p)left parenthesis, p, right parenthesis.

Answers

Your formula would be 3(p+0.75)=5.88


Because you have 3 pounds and 0.75 for each.

Solving the equation by distributing, you will get P=1.21


Hope this helps!

The equation will be 3 (p + 0.75) = 5.88. Then the original price per pound p will be 1.21.

What is the solution to the equation?

The distribution of weights to the variables involved that establishes the equilibrium in the calculation is referred to as a result.

In winter, the price of apples suddenly went up by a $0.75 dollar sign per pound. Sam bought 3 pounds of apples at the new price for a total of $5.88 dollar sign.

The original price per pound p will be

3 (p + 0.75) = 5.88

p + 0.75 = 1.96

p = 1.96 - 0.75

p = 1.21

The equation will be 3 (p + 0.75) = 5.88. Then the original price per pound p will be 1.21.

More about the solution of the equation link is given below.

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About 36,100,000 households in the U.S. have cats and about 43,300,000 households have dogs. About how may more households dogs and cats

Answers

theres about a 7,200,000 difference between household dogs vs household cats 

Which pair of angles are interior angles?

A. 1 and 8

B. 3 and 6

C. 3 and 4

D. 3 and 5

Answers

B. 3 and 6 opposite sides of the transversal but inside the two lines  

3 & 5 are the interior angles

 Answer is D

simplify
14+4(12−34)2

Answers

The answer for that is -162

Answer:  The required simplified answer is 1950.

Step-by-step explanation:  We are given to simplify the following algebraic expression :

[tex]E=14+4(12-34)^2~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]

To simplify the given expression, first we evaluate the square term, multiply it by 4 and add the result to 14.

From expression (i), we get

[tex]E\\\\=14+4(12-34)^2\\\\=14+4(-22)^2\\\\=14+4\times484\\\\=14+1936\\\\=1950.[/tex]

Thus, the required simplified answer is 1950.

what is 3(7x-6)<-81?

Answers

Hey there! How are you doing today?

3(7x - 6) < -81

First, we need to apply the Distributive Property to the left side of the inequality.
This mathematical term means to multiply the number or variable outside of the parenthesis to all numbers and/or variables on the inside of the parenthesis.

Here's an example;

3(2 + 1)
Multiply the outside number by all inside numbers.
3(2) + 3(1)
Multiply.
6 + 3
Simplify the expression.
9.

Now that we've explained our concept for distributing, let's apply what we now know to our current problem.

3(7x - 6) < -81

Apply the Distributive Property to the left side of the inequality.

3(7x) + 3(-6)
Multiply.

21x - 18

We now have:

21x - 18 < -81

Now we need to isolate the variable. To do this, we need to make sure that 'x' is by itself. Since x is being subtracted by 18, we need to apply the opposite order of operations to both sides of the inequality.

Add 18 to both sides to isolate the variable.

21x < -63

We now need to solve for x. To solve for x, we need to divide both sides by 21, as iur variable is being multiplied by 21.

We are now left with:

x < -3

This is your final solution to your inequality.

I hope this answer helps you, and feel free to ask me any questions you have in the comments below this answer! Have a great day, and thank you for asking your question here at Brainly!

if a=b then ac=bc. this called the of quality.(2words)

Answers

I'm not sure how this is 2 words, as the answer is the Multiplication Property of Equality.

Hope this helps!

Elton pours 41 1/4 ounces of water from a large pitcher into a bottle. That amount is 2/5 of the water that was in the pitcher. There were _____ ounces of water in the pitcher.

Write your answer as a mixed number in lower terms.

Answers

Okay. 41 1/4 is 2/5 if what was previously in the pitcher. In this case, we have to divide to see how much was previously in the pitcher. We convert 41 1/4 to an improper fraction, which is 165/4. Then we must keep that fraction the same, change the sign to a multiplication sign, and flip the second fraction over. So turn 2/5 into 5/2. 165/4 * 5/2. When you do that, you should get 825/8 or 103 1/8 when simplifies. There were 103 1/8 ounces of water in the pitcher.

Grandpa Schmidt is 75 years old this is nine years less than seven times the age of Junior submit how old is Junior

Answers

Let the age of Junior be x,

age of grandpa schmidt = 7x + 9
7x + 9 = 75
7x = 66
x = 66/7
= 9.43 (to three significant figures)

Junior is 9.43 years old.

How many ways are there to separate these 10 people into two groups, if no group can have less than 2 people?

Answers

501 The number of ways of selecting n out of m is m!/(n!m!). So let's do that for selecting 2, 3, 4, 5, 6, 7, and 8 out of 10. 2!/(2!8!) = 45 3!/(3!7!) = 120 4!/(4!6!) = 210 5!/(5!5!) = 252 6!/(6!4!) = 210 7!/(7!3!) = 120 8!/(8!2!) = 45 Now add them all together. 45 + 120 + 210 + 252 + 210 + 120 + 45 = 1002 But you're not quite done. It there really any difference between having a group with persons AB and the 2nd group being CDEFGHIJ or the first group being CDEFGHIJ and the 2nd group AB? The answer is no, so you need to divide the number above by 2, giving 1002 / 2 = 501 So there are 501 to separate 10 people into 2 groups with each group having at least 2 people.

what is the measure of an angle that turns through 1/12 of a circle

Answers

A circle is 360˚. An angles that turns through 1/12 of a circle would be 1/12 of 360˚.

Work: 1/12 x 360˚ = 30˚ 


Answer: 30˚

The measure of an angle that turns through 1/12 of a circle is 30 degree.

What is Angle?

A pair of rays (half-lines) with a shared terminal are combined to form an angle. The latter is referred to as the angle's vertex, and the rays are sometimes referred to as the angle's legs and other times as its arms.

We know the complete is 360 degree.

Then, to turn 1/12 of circle

= 360 x 1/2

= 360 / 12

= 30 degree

Thus, the measure of angle is 30 degree.

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Which expression is equivalent to x6 – 9?

Answers

x⁶ – 9, it could be written as x⁶ - 3², which expression is the difference of 2 squares (a² - b²) = (a-b)(a+b)

x⁶ - 3³ = (x³-3)(x³+3)

Answer:

(x3)2 – 32

Step-by-step explanation:

Whats the rule for this pattern, 3,1.5,0,-1.5,-3

Answers

The pattern subtracts 1.5 for each number in the pattern. 3-1.5 is 1.5. 1.5 minus 1.5 is zero. 0 minus 1.5 is -1.5. -1.5 minus 1.5 is negative 3. If we apply this rule to the next value, it would be -3 minus 1.5 which is equal to 4.5. The value after that would be 6, applying the same rule.

Final answer:

The rule for the pattern 3, 1.5, 0, -1.5, -3 is to subtract 1.5 from the previous term in the sequence.

Explanation:

The rule for the number pattern 3, 1.5, 0, -1.5, -3 is subtracting 1.5 from the previous number each time. To identify this, observe the difference between consecutive terms:

From 3 to 1.5 we subtract 1.5 (3 - 1.5 = 1.5).

From 1.5 to 0 subtract 1.5 (1.5 - 1.5 = 0).

From 0 to -1.5 subtract 1.5 (0 - 1.5 = -1.5).

And from -1.5 to -3, again subtract 1.5 (-1.5 - 1.5 = -3).

This pattern consistently decreases by 1.5, and it can be continued indefinitely by keeping this rule in mind.

Is it possible for two different numbers, when squared, to give the same result? What does this result tell you about solving an equation when the variable is squared? How many solutions will an equation like this have? Will there always be the same number of solutions for any equation with a squared variable? Explain.

Answers

x=4

 go to purplemath it helps me and it might help you
Hello,

Let's assume x and y the 2 numbers.

x²=y²
x²-y²=0
(x-y)(x+y)=0
x=y or x=-y


When the variable is squared we introduce extra solutions :

we must verify if each solution is exact.

If then 2 numbers are differents, x=-y

Example: 5 and -5 ==> 5²=25 , (-5)²=25



A soccer player runs 1 5/6 miles during the first half of a match and 2 1/2 miles during the second half. How many miles does he run during the match in total?

Answers

is he runs 1 5/6 miles during the half and 2 1/2 during the second half u will get 
  1.83 

1 5/6 = 1 5/6 
2 1/2 = 2 3/6
1 5/6 + 2 3/6=3 8/6 
3 4/3 = 4 1/3 
so your answer is 4 1/3 

If r = x, y, z and r0 = x0, y0, z0 , describe the set of all points (x, y, z) such that |r − r0| = 5.

Answers

We are concern about the vector (x-x0, y-y0, z-z0) equaling to 5.

This happens when √(x-x0)^2 + (y-y0)^2 + (z-z0)^2 = 5

Square both side:

(x-x0)^2 + (y-y0)^2 + (z-z0)^2 = 25 , a sphere

Which you will recognize as a circle of radius one centered at (x0, y0, z0)

 

Answer:

Point [tex]\left ( x,y,z\right )[/tex] represents a sphere

Step-by-step explanation:

Take [tex]r=\left ( x,y,z \right )\,,\,r_0=\left ( x_0,y_0,z_0 \right )[/tex]

We need to describe the set of all points (x, y, z) such that [tex]\left | r-r_0 \right |=5[/tex]

Solution :

For [tex]r-r_0=\left ( x,y,z \right )-\left ( x_0,y_0,z_0 \right )[/tex], we will subtract the respective elements .

[tex]r-r_0=\left ( x,y,z \right )-\left ( x_0,y_0,z_0 \right )=\left ( x-x_0,y-y_0,z-z_0 \right )[/tex]

Therefore, [tex]\left | r-r_0 \right |=\sqrt{(x-x_0)^2+(y-y_0)^2+(z-z_0)^2}[/tex]

As [tex]\left | r-r_0 \right |=5[/tex], we get

[tex]\sqrt{(x-x_0)^2+(y-y_0)^2+(z-z_0)^2}=5[/tex]

On squaring both sides, we get

[tex]\left ( \sqrt{(x-x_0)^2+(y-y_0)^2+(z-z_0)^2} \right )^2=5^2\\(x-x_0)^2+(y-y_0)^2+(z-z_0)^2=25[/tex]

The general equation of a sphere is (x - a)² + (y - b)² + (z - c)² = r², where (a, b, c) denotes the center of the sphere and r represents the radius .

So, [tex](x-x_0)^2+(y-y_0)^2+(z-z_0)^2=25[/tex] represents a sphere with center as [tex]\left ( x_0,y_0,z_0 \right )[/tex] and radius equal to 5 units

Which represents a rational Number and how can you tell?[tex] \sqrt{17} \sqrt{36} \sqrt{50} \sqrt{101} [/tex]

Answers

[tex]\bf \begin{array}{llll} \sqrt{17}\\\\ \sqrt{101} \end{array}\impliedby \textit{17 and 10 are both prime numbers} \\\\\\ \sqrt{36}\implies \sqrt{6^2}\implies \pm 6 \\\\\\ \sqrt{50}\implies \sqrt{25\cdot 2}\implies \sqrt{5^2\cdot 2}\implies 5\sqrt{2}\impliedby \textit{2 is a prime number}[/tex]

if a number is a prime number, it has no two equal factors that can produce a product of such a number, and therefore such value is an irrational number.

now, the last one, 5 is being multiplied by an irrational, and therefore the product will yield the same irrational, just a bit larger.

so, the only rational there is the ±6 really.

At the half ime show, a marching band marched in formation. the lead drummer started at a point with coordinates (–2, –5) and moved 3 steps up and 1 step right.
a. write a rule to describe the translation.
b. what were the coordinates of the drummer's final position?

Answers

a) y=3x+ 1

b) (-1, -2)

70 is 20% of what number

Answers

350 is the answer to the question
x*0.20= 70
x=70/0.20
x=350

make sense?

Natalia is making gift bags for her son's birthday party. Each bag costs $3.24 to make and she needs to make 15 bags. How much will the 15 bags cost?

A.) $48.60
B.) $47.40
C.) $486.00
D.) $4.74

Answers

The answer is $48.60 you just have to multiply the amount of bags times the cost of each bag to get your amount so
15 x 3.24 =48.60

Answer:

48.60

Step-by-step explanation:

The answer is $48.60 you just have to multiply the amount of bags times the cost of each bag to get your amount so

15 x 3.24 =48.60

Find an equation of a linear function given h(1)=6 and h(4)=-3

Answers

We can rewrite this in the form of h (t):

at t = 1, h = 6

at t = 4, h = -3

 

The linear equation is in the form of:

h = mt + b

where m is the slope and b is the h-intercept

 

So calculating for the slope m:

m = [-3 – 6] / (4 – 1)

m = (-9) / 3

m = -3

 

So,

h = -3t + b

Solving for b by plugging in any pair:

6 = -3(1) + b

b = 9

 

Therefore:

h = -3t + 9

Thirty-five states in a country have four-star hotels. Assume the country has 50 states. (a) What fraction of the states can claim at least one four-star hotel?​ (b) How many states do not have a​ four-star hotel?​ (c) Write the fraction of states without a​ four-star hotel.
a. The fraction of states with a​ four-star hotel ........ ​(Simplify your​ answer.)

Answers

(a) 7/10
the portion of states that have a four star hotel compared to how many states there are uses the fraction 35/50. You must simplify this, and to do this you find the greatest value with can divide the numerator and the denominator. This is 5. 35/5=7, and 50/5= 10, therefore, 7/10

(b) 15
simply subtract the number of states which have a four star hotel from the total number of states

(c) 3/10
this is the same logic as (a). use the answer you got from part b, and simplify the fractions 

The fraction of states with at least one four-star hotel is 7/10, 15 states do not have a four-star hotel, and the fraction of states without a four-star hotel is 3/10.

Answer to Student's Question

(a) To find the fraction of states with at least one four-star hotel, we divide the number of states with a four-star hotel by the total number of states. Therefore, the fraction is 35/50, which simplifies to 7/10.

(b) To determine how many states do not have a four-star hotel, we subtract the number of states with a four-star hotel from the total number of states: 50 - 35 = 15. So, there are 15 states without a four-star hotel.

(c) Finally, the fraction of states without a four-star hotel is the number of states without such hotels divided by the total number of states. This is 15/50, which can be simplified to 3/10.

The Hamptons family has a fish tank holding 10,450 ml of water. The water is leaking at a rate of 270 ml per minute. Define the input and output in the given scenario

Answers

The input is any variable which goes into the system. In this case there is no input.

 

While the output is any variable going out of the system. In this case the output is the amount of water which leaked out.

Answer:

The number of minutes represents input and remaining water represents output.

Step-by-step explanation:

Given,

The original quantity of the water in the tank = 10,450 ml,

Also, the quantity of the water leaked per minute = 270 ml,

Thus, the quantity water leaked in x minutes = 270x

∵ Remaining water in the tank ( say y ) = Original water - leaked water

y = 10450 - 270x,

Which is the equation that shows the given scenario.

In this equation, x represents the input value and y represents the output value,

Hence, the number of minutes represents input and remaining water represents output.

I thought of a number, multiplied it by 2 1/2 , divided the result by 1 1 /5 , subtracted 7/18 from it, and got 1 5/6 . What was my number?

Answers

Final answer:

The student's original number was 1 3/45. This was obtained by reversing the processes described in the problem and applying them to the final number.

Explanation:

To solve this problem, we basically need to reverse the operations given in the problem and perform them on the final answer 1 5/6. Let's start:

Add 7/18 to 1 5/6. The sum is 2. Multiply 2 by 1 1/5. The product is 2 2/5. Finally, divide 2 2/5 by 2 1/2. The quotient, which is the number the student originally thought of, is  48/45 or 1 3/45.

So the student's original number was 1 3/45.

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