i know your looking at this plz just answer this i need help i will give brainlist and 5.0 and say thanks

How do i get the answer for 2/3 * 10/3

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

4. bob solved the inequality problem below incorrectly. explain his error and redo the problem showing the correct answer. −2x + 5 < 17 −2x + 5-5 < 17-5 -2x/-2 < 12/-2 x < -6