On his first two social studies tests, billy made an 86 and a 93. what grade must billy make on the third test to have an average of 90 for all three tests?

On a piece of paper graph f(x)=5•(0.4)^x

Captain umaima has a ship, the h.m.s. khan. the ship is two furlongs from the dread pirate nadia and her merciless band of thieves. the captain has probability 3/7 of hitting the pirate ship. the pirate only has one good eye, so she hits the captain's ship with probability 2/5. if both fire their cannons at the same time, what is the probability that the captain hits the pirate ship, but the pirate misses.

2pointswhat is the best next step in the construction of the perpendicular bisector ofab?