Is (4,10), (7,-2), (5,4), (7,6) a function?

Can someone check my answer? you

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

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