to find the slope for the first one, use the formula 
(It's the slope formula)
so... 
then plug in... 
this line has a slope of 0
As for the miles problem, to find mph, the miles have to be at 1.
so... 
therefore, he drove 60.5 mph
Acceleration is the answer
28 degrees is the answer , 76+76= 152, 180-152+ 28
Final answer: x=9
your welcome