Construct a truth table for the following expression: a + (b · a)
compare with the following tables and select the correct one.

explain!

The formula for the area of a triangle is: A = 1/2 * b * h, were A is the area, b is the base, and h is the height. If h is the height of the triangle, then b will equal h - 7. Equation:  A = 1/2 * b * h A = 204 b = h - 7 Substitution: 1/2 * (h - 7) * h = 204 Multiply by 2 to clear fractions: (h - 7) * h = 408 h2 - 7h = 408 Subtract 408 from both sides: h2 - 7h - 408 = 0 You can now solve this by factoring or by using the quadratic formula. Factoring: The factors of h2 - 7h - 408 = 0, are (h + 17) and (h - 24). Note, you will get the same two answers using the quadratic formula. Using the Zero product principle: h + 17 = 0 h = -17, we can discard this solution since the cannot be negative. h - 24 = 0 h = 24 The height of the triangle is 24 centimeters.