MARK A.

asked • 08/28/19

This question seems so simple yet I'm having trouble understanding how to get the answers

Sergio runs a 100-meter race. 7 seconds after the race started Sergio is 35 meters from the starting line and reaches his max speed; he runs at this max speed for the rest of the race. Sergio notices that he is 70 meters from the starting line 12 seconds after the race started.


What is Sergio's max speed?



Suppose Sergio runs for an additional z seconds after reaching his max speed...


How far will Sergio travel during those additional z seconds?



What is Sergio's distance from the starting line 7+z seconds after the race started?



What is Sergio's distance from the starting line 

x

 seconds after the race started (provided 

x≥7

)?




2 Answers By Expert Tutors

By:

MARK A.

what do they mean by "z" seconds, how is that calculated?
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08/28/19

MARK A.

I'm having trouble with the last 2 parts still of the question
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08/28/19

Isaac C.

tutor
Z is a placeholder. It is supposed to represent any possible number you might choose. For example if z = 3, 7 * Z means that in 3 seconds, the man will cover 7 * 3 or 21 extra meters. In 4 seconds, he would cover 7 * 4 or 28 extra meters.
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08/30/19

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