In the diagram of triangle ABC below, AB = AC. The measure of ZB is 40°.
What is the measure of ZA?

Ok for question in the picture : the y axis is measured in gallons not hours. So niether one of the choices with 10 and 50 in them are correct. The gallons go up from 10-50gallons during the time interval 4<x<7 hours. So, the first answer choice is correct.

1. for this one I would just plug in the point (7,-2) to each answer choice because they all have a slope of -3.
y+2 = -3(x-7)
-2+2= -3(7)+21
0=0
after plugging them in I got the third answer choice is correct.

Any questions?