#18 mrs. rothberg baked 500 muffins on saturday and 3 times as many muffins on sunday. if the sold 5 muffins for $4, how much would she earn by selling her muffins on both days?
#19 jack had $80 more than eric. when jack spent $30, he found that the amount of money he had left was twice as much as what eric had. how much did the boys have altogether in the beginning?

Someone answer asap for ! a discount store’s prices are 25% lower than department store prices. the function c(x) = 0.75x can be used to determine the cost c, in dollars, of an item, where x is the department store price, in dollars. if the item has not sold in one month, the discount store takes an additional 20% off the discounted price and an additional $5 off the total purchase. the function d(y) = 0.80y - 5 can be used to find d, the cost, in dollars, of an item that has not been sold for a month, where y is the discount store price, in dollars. create a function d(c(x)) that represents the final price of an item when a costumer buys an item that has been in the discount store for a month. d(c(x)) =

Find two numbers if their sum is 91 and the ratio is 6: 7?

Solve the inequaliy: (x^2+2)(x−2)^2(6−2x)> 0