Jerry purchase eight trees to have planted at the house. the store charge a delivery fee of $5 per tree. the total cost of the trees including the delivery was $168 how much did each tree cost

What situation is an example of an observational study

Need this asap if anyone can i would be very grateful. if you could show workings that would really

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