Please help meee is a quiz

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

A)a square brown tarp has a square green patch green in the corner the side length of the tarp is (x + 8) and the side length of the patch is x what is the area of the brown part of the tarpb)a square red placemat has a gold square in the corner the side length of the gold square is (x - 2) inches with the width of the red region is 4 in what is the area of the red part of the placemat

Solve for p: 21 , = 3/4 pit's fraction problem