Is the expression 2•4 equal to the expression 8x? Explain your answer

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

What are linear equations? could'ya explain too me, ? ! and how do you see what graph is a proportional relationship?

The price of a lawn mower is x dollars. the store is having a 75% end of summer clearance sale. which expression can be used to find the clearance price of the mower? a) .25x b) .75x c) x - .25(75) d) x + .25(75)