If Calvin can ride his bike at the speed of 7mph, it will take him 3 hours to travel 21 miles

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?

3. a sum of $2700 is to be given in the form of 63 prizes. if the prize is of either $100 or $25, find the number of prizes of each type.