How to find derivative of a curved graph.

What two criteria are needed for triangles to be similar

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

At a certain temperature the speed of sound in the air is 330 meters per second. which of the following expressions would convert this speed into kilometers per second