phill sold 146 magazine subscriptions he work for two weeks and sold same amount each week how many subscriptions did he sell each week ​

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25

Collin did the work to see if 10 is a solution to the equation r/4=2.4

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