Use substitution to determine whether the value for x is a solution for the equation. 3x + 10 = 25 x = 5 5x − 10 = 25 x = 6 6x − 18 = 6 x = 4 4x + 12 = 40 x = 7 8x + 12 = 28 x = 3

Use the following statements to write a compound statement for the conjunction or disjunction. then find its truth value. p: an isosceles triangle has two congruent sides. q: a right angle measures 90° r: four points are always coplanar. s: a decagon has 12 sides. a) a right angle measures 90° or an isosceles triangle has two congruent sides; true. b) a right angle measures 90° and an isosceles triangle has two congruent sides; true. c) a right angle measures 90° and an isosceles triangle does not have two congruent sides; false. d) a right angle measures 90° or an isosceles triangle does not have two congruent sides; true.