What is side QT congruent too

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)