Please answer this correctly

If i have 20$ and i gave 5$ away how much i got

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax

Astudent draws two parabolas both parabolas cross the x axis at (-4,0) and (6,0) the y intercept of the first parabolas is (0,-12). the y intercept of the second parabola is (0,-24) what is the positive difference between the a values for the two functions that describe the parabolas