A biologist is studying the depths of plants growing near the surface of the ocean. He uses negative numbers to represent the depths of plants he finds below sea level.

it is x=-4

step-by-step explanation:

okay..i will pick 8!

yes

step-by-step explanation:

so of course you want to start by plugging the 5 in which goes to 7(5)+3(5)=50 because 7*5=35 and 3*5=15 and then add them together, then plug in the 5 to the other equation as well 9(5)+5=50 because 9*5= 45 and then add 5 and so yes they are equivalent.