Bob left home riding his bike at a rate of 10 mph to go to the lake. Cheryl, his wife, left 45 minutes later driving her car at a rate of 25 mph. how long will it take Cheryl to catch up Bob?

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

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1,589.63 in.^3

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