Can someone pls tell me how this lady got 13. Where did the 36 go? even my calculator says it's 49.​

Which one ? is the answer and how to find this answer

Amachine part consists of a half sphere and a cylinder, as shown in the figure. the total volume of the part is π cubic inches.

If you have a set of parallel lines a and b cut by transversal x, if angle 1 = 167 degrees, what is angle 4 and why. also what is the measure of angle 5 and why? you need to use the names of the angle relationship and explain.