FIND THE GENERAL TERM OF THE FOLLOWING SUCCESSION: 2, 5, 8, 11, 15, ... It's not 3 because 11+3 it's not 15

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. if we recall that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side, which lengths make sense for possible values of b? select two options.