Explain which property of equality is used to arrive at the conclusion for the following if x=4 then x+12=16

The graph shows the distance kerri drives on a trip. what is kerri's speed?

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?

Anumber cube is rolled two times in a row. find the probability it will land on 2 on the first roll and a number greater then 4 on the second roll