Jacob rode his bicycle 144 miles in 9 weeks, riding the same distance each week. Lesley rode her bicycle 84 miles in 6 weeks, riding the same distance each week. How many more miles did Jacob ride his bicycle than Lesley per week they rode?

Jacob rode his bicycle 2 miles per week more than Lesley per week.  

Step-by-step explanation:

We are given the following in the questions:

Jacob rode his bicycle 144 miles in 9 weeks.

Number of miles rode in 1 week by Jacob =

Lesley rode her bicycle 84 miles in 6 weeks.

Number of miles rode in 1 week by Lesley =

Thus, Jacob rode his bicycle more than Lesley by

Thus, Jacob rode his bicycle 2 miles per week more than Lesley per week.

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.