The radius of a cylinder is 15 cm the volume of the cylinder found using 3.142 approximate pi is 19,782 cm to the third power what is the height of the cylinder

The table below shows the height of a ball  x  seconds after being kicked.  what values, rounded to the nearest whole number, complete the quadratic regression equation that models the data? f(x)  =  x2  +  x  +  0based on the regression equation and rounded to the nearest whole number, what is the estimated height after 0.25 seconds?   feet

This is so hard and it’s for a test

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years