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2 years ago

If f(x)=x^2-45, and f(2a)= -20, what is the value of a

Mathematics

1 answer:

Klio2033 [76]2 years ago

5 0

Hope this helps!!! :)

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Zepler [3.9K]

I think it's C, because first you multiply all the sides which is 112 then multiply by 3 and the answer it's 336 if I'm correct.

7 0

3 years ago

What is the measure of ∠r?

LUCKY_DIMON [66]

100 because of complementary angles

8 0

2 years ago

The area of a circle is 161 in. What is the radius?

kirill [66]

Answer:

Approximately 7.16 in

Step-by-step explanation:

Hi there!

Area of a circle equation: $A=\pi r^2$ where r is the radius

Plug in the given area 161 in.²

$161=\pi r^2$

Divide both sides by π to isolate r²

$\frac{161}{\pi} =\frac{\pi r^2}{\pi} \\\frac{161}{\pi} =r^2$

Take the square root of both sides to isolate r

$=r^2\\\sqrt{\frac{161}{\pi}} =r\\7.16=r$

Therefore, the radius of the circle is approximately 7.16 in.

I hope this helps!

7 0

2 years ago

Please help me!

Taya2010 [7]

Answer:

x = 12
Side = 23 units

Step-by-step explanation:

STU is an equilateral triangle. And:

ST = 2x - 1
SU = 5x - 37
TU = x + 11

All sides are equal. Then take one pair and solve for x:

2x - 1 = 5x - 37
3x = 36
x = 12

Substitute x to find the side length:

2x - 1 = 5x - 37 = x + 11 = 23

8 0

2 years ago

Please help me with this

notka56 [123]

Answer:

Option 3

Step-by-step explanation:

Download pdf

4 0

3 years ago