Ali's dog weighs 8 times as much as her cat. together, the two pets weigh 54 pounds. how much does ali's dog weigh?

Can someone me and plz do the problem

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible