Answer Happy

Please explain step by step #71 and #72. will give thumbs up.
In the following exercises, evaluate the integrals of the functions graphed using the formulas for areas of triangles and circles, and subtracting the areas below the x-axis. 70. -72 18x X² LŐ -12 - 8x - x² 2x- X² 4 6 4 321 0 71. ут 3 2 0 72. Š 4 1-x-1/ 3 2 1- ܘܝ ܚ ܂ -N -2- -3- 2 2 x 41 2 12x - x² 4 4 6 6 8 3 x 91 8 X-4-2 10 -72 18x X² 8 10 10 12X 12X 12X