Can you help solve for x in these three problems?

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

Which statement about the relative areas of δabc and δxyz is true? the area of δabc > the area of δxyz the area of δabc < the area of δxyz the area of δabc = the area of δxyz more information is needed to compare.

How to use order of operation in 20 divide by 4 multiply 5 = 1