Find the area of an equilateral triangle (regular 3-Gon) with a given measurement

What signals you that factoring by grouping is the best method to use when factoring a problem?

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

The length of a rectangle is x times the square root of 100. the width is one-half y more than three-halves x. given that the area of the rectangle is 125 cm2, which equation could represent the rectangle in terms of x and y? a) 5xy − 15x = 125 b) 5xy + 15x = 125 c) 15x2 − 5xy = 125 d) 15x2 + 5xy = 125