There are 20 students in the classroom. 5 of these students are selected to go to an assembly. how many such selections are possible?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11