PLEASE HELP If the perimeter below is 70 units which equation is true?

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.