Neil is going to a bookstore 45 miles away. The bridge was closed on the way back, so he had to take an alternate route and had to drive 15 mph slower, which make the trip
back take 7 minutes longer. How fast was he going on the way to the bookstore?

if this is really you s much. i only have 3 points left and i have 2 questions to ask

make sure you have version 2.50

try looking in the very back of the book : )

step-by-step explanation:

you can download it here

the answer is 15.50 for one mile

b) is slope: 0   y- intercept 15.5