Which expression is equivalent to 2x^2-
2x + 72

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

On a cm grid, point p has coordinates (3,-1) and point q has coordinates (-5,6) calculate the shortest distance between p and q give your answer to 1 decimal place

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.