321 ÷ 40 long division what the answer showing work

Abouncy ball is dropped such that the height of its first bounce is 5.5 feet and each successive bounce is 64% of the previous bounce's height. what would be the height of the 7th bounce of the ball? round to the nearest tenth (if necessary).

Find the value of the variable and the length of each secant segment

Solve the system of equations. y= 2x y= x^2 - 15