May anybody please help me?

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Select the number of ways in which a line and a circle can intersect

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