Inputting variables

Question

A runner's heart rate in beats per minute is given by the formula Heart rate = 65 + 53 / (4t + 1) where t is the number of minutes after the start of a cool-down period. Find the runner's heart rate in 10 minutes. When is the runner's heart rate equal to 68 beats per minute.?

Answer 1

first part, heart rate in 10 minutes, you substitute 10 into the formula

which is 65 + 53 / (4*10+1) = 65 + 53/41 ~=66

second part you are expected to solve 65 + 53/(4t+1) = 68

or 53/(4t+1) = 3

4t+1 = 53/3

t = (53/3 - 1) / 4 ~= 4 (minutes)

Answer 2

Simplify the expression.

 

x2 + x - 6

x2 - 4

·

x2 - 9

x2 + 6x + 9

 

Answer 3

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Answer 4

Variable is a location in memory where you can store a value while your code od running.

Answer 5

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Answer 6

a^3 + a^2 + a = 180

Answer 7

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