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.

9a⁸ - 2a⁸ = 7a⁸

The formula for circumference is circle diameter x π. Circle diameter is 2 x radius:

c = πd
c = π(2 * r)
c = π(2 * 13)
c = 26π

To solve this equation, isolate the variable for which you are solving (c) on one side of the equation and put everything else on the other side.

5c - 2x = c - 3x + 1
5c = c - 3x + 1 + 2x
5c - c = -3x + 1 + 2x
4c = -x + 1
c = \( \frac{-x + 1}{4} \)
c = \( \frac{-x}{4} \) + \( \frac{1}{4} \)
c = -\(\frac{1}{4}\)x + \(\frac{1}{4}\)

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 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.

6a + 4a = 10a