PLS HELP<3ty this is due today! so please helppp tysmmm and have a great night or morning! :) (spam)

The tile along the edge of a triangular community pool needs to be replaced? ?

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 would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove