There are 25 students in a class, 7 of them will be chosen to go on a field trip. How many ways can these students be chosen.

Find the difference (8ab+a+2) - (3ab+6)

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Apyramid fits exactly inside a cube. the cube and the pyramid share the same square base, and they are both exactly the same height. the volume of the cube is 66 cubic inches. what is the volume of the pyramid? explain your answer. answer asap