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2 years ago

12

Amy and Stephanie were playing a number game. Amy picked a number and told Stephanie that if she added 7 to the number and multi

plied the sum by 2, it would equal 4. Which equation could Stephanie use to find the number, x?

1 answer:

Butoxors [25]2 years ago

6 0

Answer:

(X+7)*2=4

Step-by-step explanation:

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Fumi's backyard has an area of 10,359 Sq ft. write this in scientific notation

garik1379 [7]

The answer is 1.0359 x 10^1 because it has to be between 10 and 1.

3 0

2 years ago

The Harrison family paid $14,400 in rent last year. The landlord has decided to raise rent 2.5% each year. How much will the Har

skelet666 [1.2K]

Answer: $16,200

Step-by-step explanation:

$14,400$ rent.

Raise of 2.5% (0.025)/year.

5 years.

Take the rent (14,400) and add 2.5% (0.025) of it (14400) for five (5) years.

$14400+0.025(14400)(5)$

$14400+1800\\=16200$

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2 years ago

Let f(x) = x2 − 16. Find f−1(x)

Yanka [14]

Answer:

$f^{-1}(x)=\pm\sqrt{x+16}$

Step-by-step explanation:

$f(x)=x^2-16$

To find the inverse of this function, temporarily the f(x) with a y (or whatever else you want) and then solve for the x.

$y=x^2-16\\y+16=x^2\\x=\pm\sqrt{y+16}$

Now, you can swap the variables again and write the function.

$f^{-1}(x)=\pm\sqrt{x+16}$

3 0

2 years ago

mittens are marked down 25% the sale price is 3.15 a pair what was the original price of a pair of mittens

Sliva [168]

$12.6 -- 25% of 12.6 is exactly $3.15

I did this by taking 3.15 / 0.25

6 0

3 years ago

Read 2 more answers

What it the x and y intercept of y=2x^2+3x+1

babunello [35]

x = -1

y = 1

To find this, input the equation into a graphing calculator, whether online or an actual one, and you have two options:

1 - Search for the points in which the line crosses the x and or y axis.

2 - Hit 2nd Graph to access the table and find when x and y equal zero.

Hope this helps!

5 0

2 years ago