Chelsea played her tuba from 4:25 to 5:07 how long did Chelsea play her tuba?

Which expression gives the area of the triangle shown below

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?

What is the sum of the first 8 terms of the geometric series