Which is a correct expansion of (2x+3)(2x^2-5) a. 2x•2x^2+2x•(-5)+3•2x+3•(-5) b. 2x•2x^2+2x•(-5)+3•2x^2+3•(-5) c. 2x•2x^2+3•2x^2+2x^2•(-5)+3•(-5)

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?