Prime, because the only number that can go into it are 19 and 1
a) The first integral corresponds to the area under y = f(x) on the interval [0, 3], which is a right triangle with base 3 and height 5, hence the integral is

b) The integral is zero since the areas under the curve over [3, 4] and [4, 5] are equal but opposite in sign. In other words, on the interval [3, 5], f(x) is symmetric and odd about x = 4, so

c) The integral over [5, 9] is the negative of the area of a rectangle with length 9 - 5 = 4 and height 5, so

Then by linearity, we have

Since it says m1 is 120 and it says find m3 don’t you need to multiply or I’m wrong
It is an acute triangle because none of its angles are equal to (right) or above (obtuse) 90 degrees.
There isnt one its has to be consistent but honestly idk