Please help me! I don’t understand

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?