Solve and explain please and thank you

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

Question 1 of 10 2 points different groups of 50 graduates of an engineering school were asked the starting annual salary for their first engineering job after graduation, and the sampling variability was low. if the average salary of one of the groups was $65,000, which of these is least likely to be the average salary of another of the groups? o a. $64,000 o b. $65,000 o c. $67,000 o d. $54,000