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.

7a⁷ - 2a⁷ = 5a⁷

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.

9a + 6a = 15a

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.

b - 9 < \( \frac{b}{7} \)
7 x (b - 9) < b
(7 x b) + (7 x -9) < b
7b - 63 < b
7b - 63 - b < 0
7b - b < 63
6b < 63
b < \( \frac{63}{6} \)
b < 10\(\frac{1}{2}\)

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

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