Alguien puede ayudarme con este problema? también hay que desarrollar la ecuación algebraica

un intermediario compro un determinado número de refacciones para camionetas de 2 toneladas, con $720 y vendió algunas, excepto 18, gano $6 en cada una. sabía que con el dinero de la venta podría haber comprado 3 refacciones más que antes, calcula el precio de cada refacción

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?

Find the value. a. 0.003 b. 0.03 c. 0.3 d. 3

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?