To multiply fractions, multiply the numerators together and then multiply the denominators together:

\( \frac{1}{7} \) x \( \frac{1}{8} \) = \( \frac{1 x 1}{7 x 8} \) = \( \frac{1}{56} \) = \(\frac{1}{56}\)

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 8 workers at the company now and that's enough to staff 2 crews so there are \( \frac{8}{2} \) = 4 workers on a crew. 5 crews are needed for the busy season which, at 4 workers per crew, means that the roofing company will need 5 x 4 = 20 total workers to staff the crews during the busy season. The company already employs 8 workers so they need to add 20 - 8 = 12 new staff for the busy season.

To multiply terms with exponents, the base of both exponents must be the same. In this case they are so multiply the coefficients and add the exponents:

z⁷ x z⁵
(1 x 1)z^{(7 + 5)}
z¹²

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

Latoya scored 79% on the test meaning she earned 79% of the possible points on the test. There were 210 possible points on the test so she earned 210 x 0.79 = 165 points. Each question is worth 3 points so she got \( \frac{165}{3} \) = 55 questions right.