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

Twenty points. 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

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25