Factor this polynomial completely.
x^2-81

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

The length of a rectangular piece of land is 92 yards more than three times its width. the perimeter is 760 yards. find its dimensions.

The equation |pl = 2 represents the total number of points that can be earned or lost during one turn of a game. which best describes how many points can be earned or lost during one turn? o o -2 2 oor 2 -2 or 2 o