Which expression is equivalent to 3 square root of 4 ⋅ 3− square root of 9? (this would help alot)

Hello, i need compare km^2 and km. what's difference in this?

Add: (6x^2-5x+3) + (3x^3+7x-8) a. 9x^2+12x-5 b. 9x^2+2x+11 c. 9x^2+2x-5 d. 9x^2-2x+5

Adentist's office and parking lot are on a rectangular piece of land. the area (in square meters) of the land is represented by x2+x? 30. a. write a binomial that represents the width of the land.