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

v = h x l x w
v = 8 x 6 x 4
v = 192

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:

(y + 7)(y + 2)
(y x y) + (y x 2) + (7 x y) + (7 x 2)
y² + 2y + 7y + 14
y² + 9y + 14

An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite:

d° = b° + c°

To find angle c, remember that the sum of the interior angles of a triangle is 180°:

180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 43° - 42° = 95°

So, d° = 42° + 95° = 137°

A shortcut to get this answer is to remember that angles around a line add up to 180°:

a° + d° = 180°
d° = 180° - a°
d° = 180° - 43° = 137°

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.

-6a + 2 > 8 + 9a
-6a > 8 + 9a - 2
-6a - 9a > 8 - 2
-15a > 6
a > \( \frac{6}{-15} \)
a > -\(\frac{2}{5}\)

A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.