calculus
posted by Alyssa on .
the area of the first quadrant bounded by the yaxis, the line y=4x, and the graph of y=xcosx is approximately

The hard part is to find the intersection of
y = 4x and y=x  cosx
I ran it through Wolfram and got
x = 1.85825
http://www.wolframalpha.com/input/?i=xcos%28x%29+%3D+4x
area = ∫ (4x  x + cosx) dx from 0 to 1.85825
= ∫(4  2x + cosx) dx from ....
= [ 4x = x^2 + sinx] from ....
= you do the arithmetic
make sure your calculator is set to radians