Giúp tôi bài 48. 49 ạ

Consider the integral: 4 0 16 − y2 − 16 − y2 4 1 x2 + y2 dz dx dy . (a) describe w. use the standard view of the x, y, and z axes. front half of a cone with a rounded top. full cone with a flat top. right half of a cone with a flat top. front half of a cone with a flat top. right half of a cone with a rounded top.

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

What other information do you need to prove triangle dac=bca by asa