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.

8a² + 7a² = 15a²

A monomial contains one term, a binomial contains two terms, and a polynomial contains more than two terms.

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 equal sign and the answer on the other.

5a - 1 = \( \frac{a}{-8} \)
-8 x (5a - 1) = a
(-8 x 5a) + (-8 x -1) = a
-40a + 8 = a
-40a + 8 - a = 0
-40a - a = -8
-41a = -8
a = \( \frac{-8}{-41} \)
a = \(\frac{8}{41}\)

The volume of a cylinder is πr²h:

v = πr²h
v = π(8² x 9)
v = 576π

A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.