A) If (a + b) varies as (a - b) directly, prove that (a^2-b^2) varies as "ab" directly. b) If a varies as b directly, prove that (a^2– b^2) varies as "ab” directly

Graham’s monthly bank statement showed the following deposits and withdrawals. -$25.20, $42.75, -$22.04, -$18.50, $74.11. part a if grahams baldness in the account was $37.86 at the beginning of the month,! 27/4! 2// the account balance at the end of the month? ? plz i will give you 100 points