The slope is 1, because the slope form is:

Where the m is the slope. Here, m=1.
If it's 125 + 0.375 then the answer is 125.375
and for the second it's 0.75
A. 7.5 pages per hour B. $2.66 for one page
The third one :) I hope I did it right
(3)(17.25) = 51.75; he spent $51.75
Because everything in the problem is positive, no negative numbers are needed.