Inever really understood arrays. kinda need

7x+8y=-18, 4x-9y=-3 solve the system of equations

Can anyone me with 32,33,36,37,and 40.

There are three grizzly bears in the city zoo. yogi weighs 400.5 pounds, winnie weighs 560.35 pounds, and nyla weighs 628.29 pounds. what is the average weight of the three bears? (hint: what do they weigh all together? ) a. 502.97 pounds c. 604.38 pounds b. 529.71 pounds d. 794.57 pounds