Trying to make honor roll

eric purchased n notebooks. they were 4 dollars each. write an equation to represent the total cost c that eric paid.

What are the vertical asymptotes of the function f(x) =5x+5/x2 + x-2

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

The length of a rectangle plus its width is 25 cm. the area is 156 square cm. what are the length and width of the rectangle? separate the answers with a comma.