HELPP asap I’ll mark you as brainlister

Find the complete factored form of the polynomial 40m^3n^2+45m^2n^6

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)