What is 50/90 in simplest form fraction

Closing a credit card usually _your debt ratio.a. increasesb. decreasesc. improvesd. has no effect on

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?  

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