An integer is any whole number, including zero. An integer can be either positive or negative. Examples include -77, -1, 0, 55, 119.

By buying two shirts, Bob will save $15 x \( \frac{30}{100} \) = \( \frac{$15 x 30}{100} \) = \( \frac{$450}{100} \) = $4.50 on the second shirt.

So, his total cost will be
$15.00 + ($15.00 - $4.50)
$15.00 + $10.50
$25.50

First, solve for \( \left|c + 0\right| \):

\( \left|c + 0\right| \) + 6 = 2
\( \left|c + 0\right| \) = 2 - 6
\( \left|c + 0\right| \) = -4

The value inside the absolute value brackets can be either positive or negative so (c + 0) must equal - 4 or --4 for \( \left|c + 0\right| \) to equal -4:

So, c = 4 or c = -4.

In order to find how many additional workers are needed to staff the extra crews you first need to calculate how many workers are on a crew. There are 6 workers at the company now and that's enough to staff 3 crews so there are \( \frac{6}{3} \) = 2 workers on a crew. 6 crews are needed for the busy season which, at 2 workers per crew, means that the roofing company will need 6 x 2 = 12 total workers to staff the crews during the busy season. The company already employs 6 workers so they need to add 12 - 6 = 6 new staff for the busy season.

To add or subtract terms with exponents, both the base and the exponent must be the same. In this case they are so add the coefficients and retain the base and exponent:

8z³ + 4z³
(8 + 4)z³
12z³