The value of a painting increases by 79 percent every year. If the painting was purchased 8 years ago for $12,761, how much is it worth today? PLS I NEED HELP i would really appreciate it if you can tell me what to do to solve these problems because i have 25 !

Nine more than four times a number is the same as one less than twice the number. find the number?

Yvaries inversely as x. y =12 when x=5. find y when x=4

Pamela has a 30-year, 5.75% mortgage on her $250,000 home. she has been paying on it for 5 years, and has recently hit some financial trouble. if her lender agreed to lower the interest rate on her $231,905.47 balance to 5.5%, what will her new payment be for the remainder of the loan?