Starting from 200 ft away, your friend skates toward you and then passes you. she skates at a constant speed of 20 ft/s. her distance d from you in feet after t seconds is given by d=|200-20t|. at what times is she 60 ft from you?

Your friend is 60 ft away from you at 7 seconds and 13 seconds.

Explanation

The distance of your friend from you in feet after seconds is given by.....

When the distance of your friend is 60 ft from you, then . So....

While solving an absolute equation, we will take two cases - one for positive and another for negative. So....

and

Thus, your friend is 60 ft away from you at 7 seconds and 13 seconds.

1. 3

2. 4

3. 1

hope this ! have a great day.

-wfz

example 2 – simplify: step 1: completely factor both the numerators and denominators of all fractions. step 2: change the division sign to a multiplication sign and flip (or reciprocate) the fraction after the division sign; essential you need to multiply by the reciprocal. step 3 : cancel or reduce the fractions.