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krek1111 [17]
3 years ago
15

3x2 + 2(x2 – 20) = 16 - 2x2

Mathematics
1 answer:
lana66690 [7]3 years ago
8 0

3x(2) + 2(2x - 20) = 16 - 2x(2)

6x + 4x - 40 = 16 - 4x

10x - 40 = 16 - 4x

14x - 40 = 16

14x = 56

x = 4

Hope this helps! ;)

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If the radius of the circle is 7 cm, find its area, rounded to 2 decimal places.
stich3 [128]

Answer:

153.94

Step-by-step explanation:

The formula for area is pi*radius^2

the radius is 7, so we do pi7^2 which is 49pi

49pi is 153.93804 which is 153.94 rounded to two decimal places

8 0
3 years ago
1/4 plus 1/6 in simplest terms
Tasya [4]

Answer:

\frac{5}{12}

Step-by-step explanation:

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7 0
3 years ago
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Which of the following pairs of functions are inverses of each other?
AnnyKZ [126]

Answer:

Step-by-step explanation:

Rearrange each function to solve for x.

Switch x and y,

The resulting equation is the inverse function.

A:

f(x) = y = 5+x

x = y-5

y = x-5

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g(x) = 5-x ≠ f⁻¹(x)

g(x) is not the inverse of f(x).

:::::

B:

f(x) = y = 2x-9

x = (y+9)/2

y = (x+9)/2

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g(x) = (x+9)/2 = f⁻¹(x)

g(x) is the inverse of f(x).

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C:

f(x) = y = 2/x - 6

x = 2/(y+6)

y = 2/(x+6)

f⁻¹(x) = 2/(x+6)

g(x) = (x+6)/2 ≠ f⁻¹(x)

:::::

D:

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x = 3y - 12

y = 3x - 12

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g(x) is not the inverse of f(x).

4 0
2 years ago
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ddd [48]
Robin went on 4 rides
7 0
2 years ago
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VMariaS [17]
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-3x -3x
4=4x-4
+4 +4
8=4x
(divide each side by 4)
2=x
5 0
3 years ago
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