Which expression gives the same result as t=0

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

Diane owes $387 to her brother. if she debits her bank account $161.25 a month to pay him back, how many months will it take her to pay off the debt?

Are triangles the congruent? write the congruency statement.what is the congruency that proves they are congruent? what is the perimeter of ∆pqr?