The awnser is D to your question
The coefficients are 7.5 and 0.2. The variables are OH and OS, and the constant is 40. Good luck.
X^2+4x-12
x^2+6x-2x-12
x(x+6)-2(x+6)
(x-2)(x+6)
So, B is the answer
In hours it would be : 15 * h miles (* means x times). D = r * t. Notice that hours cancel leaving miles, the distance. Including the units in your calculations can help prevent errors.
