Need help again with math homework please! Question 1: Write an equation to solve for the question mark.

Question 2: Explain the error the student made.

Question 3: Find x.

Question 4: Find m
Thank you!!

Which represents the solution set of the inequality 5x-9 < 21? a. x < 12/5 b. x > 12/5 c. x > 6 d. x < 6

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

Aclothing designer is selecting models to walk the runway for her fashion show. the clothes she designed require each model’s height to be no more than y inches from 5 feet 10 inches, or 70 inches. which graph could be used to determine the possible variance levels that would result in an acceptable height, x?