NEED HELP ASAP, WILL GIVE BRAINLIEST What is the sum of all of the coefficients of the binomial expansion (6x-y)^4

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

Reinel saves 30% of every pay check. his paycheck last week was 560$. how much did reniel save last week?

Jim had 3,067.48 in his checking account he wrote a check to pay for two airplane tickets. his account now has 1,845.24.