7n -4 =31 solve for n

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Find the rate of change for the situation.you run 7 miles in one hour and 21 miles in three hours.

An incoming airplane is x miles due north from the control tower at an airport. a second incoming airplane is y miles due east of the same control tower. the shortest distance between the two airplanes is z miles. which of the following functions would best model the situation above?