A cylinder is a solid figure with straight parallel sides and a circular or oval cross section with a radius (r) and a height (h). The volume of a cylinder is π r²h and the surface area is 2(π r²) + 2π rh.

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.

7a⁶ + 8a⁶ = 15a⁶

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 + 2 = \( \frac{a}{3} \)
3 x (-5a + 2) = a
(3 x -5a) + (3 x 2) = a
-15a + 6 = a
-15a + 6 - a = 0
-15a - a = -6
-16a = -6
a = \( \frac{-6}{-16} \)
a = \(\frac{3}{8}\)

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

To solve this equation, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)

-7b(b - x)
-7(-5)(-5 + 3)
-7(-5)(-2)
(35)(-2)
-70