The variable s is proportional to t, and s=15 when t=75. determine t when s=70

Factor the polynomial by its greatest common monomial factor.

Harry owes the bank money. to repay his debt, he paid $150 back to the bank each month. after 10 months, his remaining debt was $6900. what was the original amount of harry's debt? how long did it take harry to pay back his entire debt?

If bill bought a home for $210,000 and he sold it a year later for $120,000 his percentage of loss is