Answer:
13 means the starting number
13 is the y-intercept (0,13)
Step-by-step explanation:
area of the triangle
1/2xbxh
1/2(12x9)
1/2(108)
area of triangle is 54in²
area of rectangle
2(L+W)
2(15+6)
2(21)
area of rectangle is 42in²
Total area is 96in²
For there to be a region bounded by the two parabolas, you first need to find some conditions on

. The two parabolas must intersect each other twice, so you need two solutions to

You have

which means you only need to require that

. With that, the area of any such bounded region would be given by the integral

since

for all

. Now,

by symmetry across the y-axis. Integrating yields

![=4\left[c^2x-\dfrac{16}3x^3\right]_{x=0}^{x=|c|/4}](https://tex.z-dn.net/?f=%3D4%5Cleft%5Bc%5E2x-%5Cdfrac%7B16%7D3x%5E3%5Cright%5D_%7Bx%3D0%7D%5E%7Bx%3D%7Cc%7C%2F4%7D)



Since

, you have

.