What value(s) of x make the equation x2 - 18x + 81 = 0 true?

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

Deshawn uses 3/4 of a box of rice to cook dinner the portion he uses weighs 12 ounces right and solve an equation to find the weight of the full box of rice

Which of the following would be a reasonable estimate for the weight of a pencil? a. 1 × 10^-20 lb b. 1 × 10^20 lb c. 1 × 10^2 lb d. 1 × 10^-2 lb