The length of the base of an isosceles triangle is x. The length of a leg is 4x-2. The perimeter of the triangle is 86. Find x PLS HELP ASAP

Which of the following are arithmetic sequences? check all that apply. a. 0.3, 0.6, 0.9, 1.2, 1.5, b. 2, 3, 6, 11, 18, c. 150, 147, 144, 142, d. 2, 4, 9, 16, 25,