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KonstantinChe [14]

3 years ago

11

If f(x) = -2x + 7, find f(8)

1 answer:

anastassius [24]3 years ago

5 0

Answer:

-9

Step-by-step explanation:

You have to plug 8 into the formula for x. f(8) = -2(8)+7 = -16+7 = -9

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Solve for x.<br> Worth 20 pts.

Vinvika [58]

You’d set up a proportion. I did 25/15=7x-40/18.
Then you would cross multiply to get 15(7x-40)=450
Distribute the 15.
105x-600=450
Add 600 to both sides, so the -600 cancels out.
Then you’re left with 105x=1050
Divide both sides by 105 and you get x=10

6 0

3 years ago

What is the surface area of this triangular prism rounded to the nearest tenth?

Eddi Din [679]

Answer:

answer its B

Step-by-step explanation:

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3 years ago

A sweater at hollister costs 42. After tax the sweater is 44.94 .what is the sales tax rate

kotegsom [21]

Subtract 42 from 44.92 and then divide by 42. So it is 7%

6 0

3 years ago

Point a is at (-7,-7) and m is at (-6,-1) what are the coordinates of point b

AlekseyPX

Answer:

The coordinates of point b are (-5,5).

Step-by-step explanation:

Given:

Point a is at (-7,-7) and m is at (-6,-1).

So, to find the coordinates of point b.

Let a (-7,-7) be $(x_{1},y_{1})$ , m (-6,-1) and b $(x_{2} ,y_{2})$ .

Now, putting the formula to get the coordinates:

$m=\frac{x_{1}+x_{2}}{2} , \frac{y_{1}+y_{2}}{2}$

⇒ $(-6,-1)=\frac{-7+x_{2}}{2} , \frac{-7+y_{2}}{2}$

So, here we will make two equations to find the value of $x_{2} andy_{2}$ :

$-6=\frac{-7+x_{2}}{2}$

multiplying both sides by 2

⇒ $-12=-7+x_{2}$

⇒ $-5=x_{2}$

And, now same method for getting the value of $y_{2}$ .

$-1=\frac{-7+y_{2}}{2}$

multiplying both sides by 2

⇒ $-2=-7+y_{2}$

⇒ $5=y_{2}$ .

The value of $(x_{2} ,y_{2})$ = $(-5,5)$ .

Therefore, the coordinates of point b are (-5,5).

4 0

3 years ago

Is 4 a solution of 3x+8=4 ? complete the statement

nordsb [41]

I think it would have to equal a fraction being -4/3

4 0

3 years ago