Recall that the area of a circle can be determined by the formula pi * r(squared). Since we are given the diameter, we can divide it by 2, giving us the radius. 10 / 2 = 5 Now that we have all of our values, we substitute them into the formula for area. 3.14 * 5(squared) This simplifies to 3.14 * 25 Which gives us 78.5 I hope that helps.

7 0

3 years ago

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Which of the following is an advantage to using equations?

guapka [62]

Answer:

C. When given two names for the same quantity, you can use algebra to solve the equation

This is correct

Step-by-step explanation:

3 0

3 years ago

How do I simplify (-13b-2b^3+9)-(-11b+7b^3+b^2)

mars1129 [50]

$(-13b-2b^3+9)-(-11b+7b^3+b^2)\\\\=-13b-2b^3+9-(-11b)-7b^3-b^2\\\\=-13b-2b^3+9+11b-7b^3-b^2\qquad\text{combine like terms}\\\\=(-2b^3-7b^3)-b^2+(-13b+11b)+9\\\\=\boxed{-9b^3-b^2-2b+9}$

4 0

3 years ago