The graph is misleading because it does not start out at 0 inches of rainfall.
To make it accurate, you'd redraw it and start with 0 inches of rainfall and go up from there.
Answer:
1360 340 x 4 = 1360
Step-by-step explanation:
a. Parameterize
by

with
.
b/c. The line integral of
over
is




d. Notice that we can write the line integral as

By Green's theorem, the line integral is equivalent to

where
is the triangle bounded by
, and this integral is simply twice the area of
.
is a right triangle with legs 2 and 5, so its area is 5 and the integral's value is 10.