PLEASE HELP WITH AND EXPLANATION

Mariah is shopping at the mall for a sweatshirt She finds a sweatshirt that is
marked down 55% of the original price of the sweatshirt is $78.25. What is the
sale price of the sweatshirt?

Whats the name of the vertical axis

What are the solutions of the equation? 5z^2 + 9z - 2 = 0 a. 1, -2 b. 1, 2 c. 1/5, -2 d. 1/5, 2

1. writing an equation for an exponential function by 2. a piece of paper that is 0.6 millimeter thick is folded. write an equation for the thickness t of the paper in millimeters as a function of the number n of folds. the equation is t(n)= 3. enter an equation for the function that includes the points. (-2, 2/5) and (-1,2)