How do i find the perimeter of a square

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

The equation m = 19.32v can be used to find the mass m in grams of a pure gold coin with volume v in cubic centimeters. carl has a coin with a mass of 37.8 grams. the coun's volume is 2.1 cubic centimeters. could the coin be pure gold? explain your reasoning. whoever answers this correctly gets marked brainliest! this is also worth a decent amount of points than normal questions!

Why would a person choose a ppo over an hmo