7z-9z is equivalent to wich of the following
a. -2
b. -2z
c. -2z2

There are 12 boy and13 girls in a class. if the teacher randomly chooses a student’s name out of a hat what is the probability it will be a girl

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?