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

8a - 3x = 5a + 6x - 1
8a = 5a + 6x - 1 + 3x
8a - 5a = 6x - 1 + 3x
3a = 9x - 1
a = \( \frac{9x - 1}{3} \)
a = \( \frac{9x}{3} \) + \( \frac{-1}{3} \)
a = 3x - \(\frac{1}{3}\)

The surface area of a cylinder is 2πr² + 2πrh:

sa = 2πr² + 2πrh
sa = 2π(8²) + 2π(8 x 8)
sa = 2π(64) + 2π(64)
sa = (2 x 64)π + (2 x 64)π
sa = 128π + 128π
sa = 256π

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.

5a - 4a = 1a

To multiply binomials, use the FOIL method. FOIL stands for First, Outside, Inside, Last and refers to the position of each term in the parentheses.