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.

3a + 8a = 11a

A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).

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.

7x - 2 < \( \frac{x}{1} \)
1 x (7x - 2) < x
(1 x 7x) + (1 x -2) < x
7x - 2 < x
7x - 2 - x < 0
7x - x < 2
6x < 2
x < \( \frac{2}{6} \)
x < \(\frac{1}{3}\)

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.

4a x 7b = (4 x 7) (a x b) = 28ab

According to the Pythagorean theorem, the hypotenuse squared is equal to the sum of the two perpendicular sides squared:

c² = a² + b²
c² = 7² + 1²
c² = 49 + 1
c² = 50
c = \( \sqrt{50} \)