Question

An isosceles triangle has two sides of equal length, a, and a base, b. The perimeter of the triangle is 15.7 inches, so the equation to solve is 2a + b = 15.7.
Which lengths make sense for possible values of b? Check all that apply.
–2 in.

Answer 1

B must be between (15.7 - 2a) and (15.7 + 2a)
(15.7-2a) < b , (15.7+2a).  It cannot equal either length.