The number of subsets that can be created from the set {1, 2, 3} is: 3 6 7 8

In the diagram below, dab and dac are adjacent angles. if mdac = 25°, what is mdab in degrees? what is mbac in degrees?

Acylinder has volume 45π and radius 3. what is it’s height?

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?