Question

f(r)=3.14r^2 what is f(5)

Answer 1

Step-by-step explanation:

Simplifying

F(5) = 3.14r2

Reorder the terms for easier multiplication:

5F = 3.14r2

Solving

5F = 3.14r2

Solving for variable 'F'.

Move all terms containing F to the left, all other terms to the right.

Divide each side by '5'.

F = 0.628r2

Simplifying

F = 0.628r2

Answer 2

Answer:

78.5

Step-by-step explanation:

3.14 × 5 × 5

3.14 × 25

78.5

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