A helicopter is hovering above a highway with 2 cars headed towards it from both directions. The angle of depression from the helicopter to car A and car B is 60 degrees. The cars 126.6 feet away from each other. How far off the ground is the helicopter?
109.6 feet off of the ground
Given the equation Pb(OH)_4 + H_2SO_4 --> Pb(SO_4)_2 + H_2O. If you have 102 grams of water then how many molecules of Lead(IV) hydroxide do you have?
8.53*10^23 molecules of Lead(IV) hydroxide
4x^2 + 2x -42