3 years ago

Find the circumference of the circle below. Use 3.14

Mathematics

1 answer:

lana66690 [7]3 years ago

3 0

Answer:

Step-by-step explanation:

C=2πr=2·π·22 =138.16cm

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Answer:

A. t < –15

Step-by-step explanation:

The temperature has to be less than -15

t < -15

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3 years ago

Simplify completely x^2+7x-30/x+10

marta [7]

Answer:

(x-3)

Step-by-step explanation:

we have

$\frac{x^{2}+7x-30}{x+10}$

step 1

Simplify the numerator

Complete the square

Equate the equation to zero

$x^{2}+7x-30=0$

$x^{2}+7x=30$

$x^{2}+7x+3.5^{2}=30+3.5^{2}$

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Rewrite as perfect squares

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Take square root both sides

$(x+3.5)=(+/-)6.5$

$x=-3.5(+/-)6.5$

$x=-3.5(+)6.5=3$

$x=-3.5(-)6.5=-10$

therefore

$x^{2}+7x-30=(x-3)(x+10)$

substitute in the numerator

$\frac{x^{2}+7x-30}{x+10}=\frac{(x-3)(x+10)}{x+10}=x-3$

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