Don't give me a uploaded question kneegars

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

Divide. reduce the answer to lowest terms.5 2/3 ÷ 3 1/9

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.