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.

(9a)(3ab) + (4a²)(8b)
(9 x 3)(a x a x b) + (4 x 8)(a² x b)
(27)(a¹⁺¹ x b) + (32)(a²b)
27a²b + 32a²b
59a²b

A triangle is a three-sided polygon. It has three interior angles that add up to 180° (a + b + c = 180°). An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite (d = b + c). The perimeter of a triangle is equal to the sum of the lengths of its three sides, the height of a triangle is equal to the length from the base to the opposite vertex (angle) and the area equals one-half triangle base x height: a = ½ base x height.

To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.

4a + 3a = 7a

To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the > sign and the answer on the other.

9c + 4 > 6 - 8c
9c > 6 - 8c - 4
9c + 8c > 6 - 4
17c > 2
c > \( \frac{2}{17} \)
c > \(\frac{2}{17}\)

An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.