I'm assuming it would be the same shape? That's also assuming that it's referring to congruent shapes and angles.
Do 252 divided by 36 and you should get 7. so the average number of calls would be 7
Zero
you can double check though
Solving radical equations are different because you would want to get everything in the equation to rational numbers.
Extraneous solutions arise when you manipulate the equation. After manipulating if a solution is found that can not satisfy the original equation(s).