A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).

The area of a triangle is equal to ½ base x height:

a = ½bh
a = ½ x 7 x 3 = \( \frac{21}{2} \) = 10\(\frac{1}{2}\)

The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:

a² + 2a - 35 = 0
(a - 5)(a + 7) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (a - 5) or (a + 7) must equal zero:

If (a - 5) = 0, a must equal 5
If (a + 7) = 0, a must equal -7

So the solution is that a = 5 or -7

A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.

To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

(2a)(4ab) + (8a²)(2b)
(2 x 4)(a x a x b) + (8 x 2)(a² x b)
(8)(a¹⁺¹ x b) + (16)(a²b)
8a²b + 16a²b
24a²b