Зr + # = 7 So what number would be the # need to be so that the answer to the equation is r=4? Explain

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

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

The price of a dozen eggs was $1.63. suppose the price increases m dollars per dozen and then the price decreases $0.12 per dozen. which expression represents the current price of eggs after the two price changes?