100, 120 , 130, 150 if i add a 0 on the ends of those numbers what will it do to the mean and median

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.

Select all the statements that apply to this figure

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.