) A plane traveled 1400 miles to Cleveland and back. The trip there was with the wind. It took 14
hours. The trip back was into the wind. The trip back took 28 hours. Find the speed of the plane in
still air and the speed of the wind.
A) plane: 73 mph, wind: 10 mph B) plane: 36 mph, wind: 30 mph
C) plane: 75 mph, wind: 25 mph D) plane: 64 mph, wind: 31 mph

Aschool typically sells 500 yearbooks each year for 50 dollars each. the economic calls does a project and discovers that they can sell 100 more yearbooks for every $5 decrease in price. the revenue for yearbook sales is equal to the number of yearbooks sold times the price of the yearbook. let x represent the number of $5 decrease in price. if the expression that represents the revenue is written in the form r(x)=(500+ax)(50-bx). to maximize profit, what price should the school charge for the yearbooks? what is the possible maximum revenue? if the school attains the maximum revenue, how many yearbooks will they sell?

Do some research and find a city that has experienced population growth. determine its population on january 1st of a certain year. write an exponential function to represent the city’s population, y, based on the number of years that pass, x after a period of exponential growth. describe the variables and numbers that you used in your equation.

Line u passes through points (-52, -18) and (-29, 53). line v passes through points (90, 33) and (19, 56). are line u and line v parallel or perpendicular?