Las fichas del peso de 10 niños, marcan en promedio 28 kg. En la oficina de control se pierde una ficha y se sabe que el promedio del resto es 27 kg. ¿Cuál es el peso del niño al que le perdieron la ficha?

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?

Evaluate the given expression if m=45 |-3m|

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39