I need to find the missing side (x). PLEASE HELP I HAVE UNTIL TOMORROW AT 10AM

Reflect the point (7,0) across the y-axis

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

What will the graph look like for a system of equations that has no solution? a. the lines will be perpendicular. b. the lines will cross at one point. c. both equations will form the same line. d. the lines will be parallel.