Help :(
I dont understand

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

Interest begins accruing the date of the transaction except for auto loans mortgages credit card cash advances credit card purchases

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1