The point-slope form:

We have the points (1, 2) and (3, 6). Substitute:

I believe its additive Inverse Property
He is false the equation should be as follows
A mixed number is an integer and a fraction that is less than one (remember that x/x = 1.)
To simplify 25/10, calculate how many times 10 goes into 25 by dividing 25 by 10. The answer is 2 with a remainder of 5 (10 x 2 = 20, 25-20 = 5).
The mixed number is 2 and 5/10, which simplifies to 2 1/2.
Steps:
57.68÷8
=7.21minutes per hour
(p.s. make sure they don't want you to round!)