The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 60° - 70° = 50°

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

c² + 4c + 3 = 0
(c + 1)(c + 3) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (c + 1) or (c + 3) must equal zero:

If (c + 1) = 0, c must equal -1
If (c + 3) = 0, c must equal -3

So the solution is that c = -1 or -3

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.

(6a)(7ab) + (2a²)(2b)
(6 x 7)(a x a x b) + (2 x 2)(a² x b)
(42)(a¹⁺¹ x b) + (4)(a²b)
42a²b + 4a²b
46a²b

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.

2a + 4a = 6a

The coordinate grid is composed of a horizontal x-axis and a vertical y-axis. The center of the grid, where the x-axis and y-axis meet, is called the origin.