The sum of 3 times d and e

How many different ways can you make change for $.50 using only nickels, dimes, and quarters?

You and a friend race across a field to a fence and back. your friend has a 50-meter head start. the equations shown represent you and your friend's distances dd (in meters) from the fence tt seconds after the race begins. find the time at which you catch up to your friend. you: d=∣−5t+100∣d=∣−5t+100∣ your friend: d=∣−313t+50∣∣

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length