To factor a quadratic expression, apply the FOIL method (First, Outside, Inside, Last) in reverse. First, find the two Last terms that will multiply to produce -28 as well and sum (Inside, Outside) to equal 3. For this problem, those two numbers are -4 and 7. Then, plug these into a set of binomials using the square root of the First variable (y²):

y² + 3y - 28
y² + (-4 + 7)y + (-4 x 7)
(y - 4)(y + 7)

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

sa = 2πr² + 2πrh
sa = 2π(1²) + 2π(1 x 6)
sa = 2π(1) + 2π(6)
sa = (2 x 1)π + (2 x 6)π
sa = 2π + 12π
sa = 14π

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.

2a⁶ - 8a⁶ = -6a⁶

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.

2c - 5x = 3c - 8x + 4
2c = 3c - 8x + 4 + 5x
2c - 3c = -8x + 4 + 5x
-c = -3x + 4
c = \( \frac{-3x + 4}{-1} \)
c = \( \frac{-3x}{-1} \) + \( \frac{4}{-1} \)
c = 3x - 4

The volume of a cube is height x length x width:

v = h x l x w
v = 3 x 5 x 4
v = 60