What would this be called please help ASAP

What is the standard form of -5x^2+2x^4-11+x^3+3x

Find the solution to this system 2,1 1,-2 1,2 -1,2

Breana is selling tickets to a choral performance. on the first day of ticket sales , she sold 3 senior citizen tickets and 1 child ticket for a total of $38. breana took in $52 on the second day by selling 3 senior citizen tickets and 2 child tickets. what is the price of a senior citizen ticket?