Homework Example

Joe Bradford

January 9, 2017

HW

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Problem example

A problem.

18. Let A = f (r) be the area of a circle of radius r .

(a) Write the formula for f (r) .

(b) Which expression represents the area of a circle whose radius isincreased by 10%? Explain.

(i) 0.10 f (r) (ii) f (r + 0.10) (iii) f (0.10 r)

(iv) f (1.1 r) (v) f (r) + 0.10

(c) By what percent does the area increase if the radius isincreased by 10%?

Answer page

18. Let A = f (r) be the area of a circle of radius r .

(a) Write the formula for f (r) .

Answer page

(b) Which expression represents the area of a circle whose radius is

increased by 10%? Explain.

(i) 0.10 f (r) (ii) f (r + 0.10) (iii) f (0.10 r)

(iv) f (1.1 r) (v) f (r) + 0.10

Answer part b

Answer page

(c) By what percent does the area increase if the radius isincreased by 10%?

Answer part c

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