| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.12 |
| Score | 0% | 62% |
What is \( \frac{1}{5} \) x \( \frac{2}{8} \)?
| \(\frac{1}{20}\) | |
| \(\frac{1}{4}\) | |
| \(\frac{1}{9}\) | |
| \(\frac{1}{21}\) |
To multiply fractions, multiply the numerators together and then multiply the denominators together:
\( \frac{1}{5} \) x \( \frac{2}{8} \) = \( \frac{1 x 2}{5 x 8} \) = \( \frac{2}{40} \) = \(\frac{1}{20}\)
What is \( 2 \)\( \sqrt{12} \) + \( 6 \)\( \sqrt{3} \)
| 12\( \sqrt{12} \) | |
| 8\( \sqrt{12} \) | |
| 8\( \sqrt{4} \) | |
| 10\( \sqrt{3} \) |
To add these radicals together their radicands must be the same:
2\( \sqrt{12} \) + 6\( \sqrt{3} \)
2\( \sqrt{4 \times 3} \) + 6\( \sqrt{3} \)
2\( \sqrt{2^2 \times 3} \) + 6\( \sqrt{3} \)
(2)(2)\( \sqrt{3} \) + 6\( \sqrt{3} \)
4\( \sqrt{3} \) + 6\( \sqrt{3} \)
Now that the radicands are identical, you can add them together:
4\( \sqrt{3} \) + 6\( \sqrt{3} \)Which of the following is not an integer?
0 |
|
1 |
|
\({1 \over 2}\) |
|
-1 |
An integer is any whole number, including zero. An integer can be either positive or negative. Examples include -77, -1, 0, 55, 119.
A machine in a factory has an error rate of 7 parts per 100. The machine normally runs 24 hours a day and produces 10 parts per hour. Yesterday the machine was shut down for 2 hours for maintenance.
How many error-free parts did the machine produce yesterday?
| 97.9 | |
| 147.2 | |
| 204.6 | |
| 144 |
The hourly error rate for this machine is the error rate in parts per 100 multiplied by the number of parts produced per hour:
\( \frac{7}{100} \) x 10 = \( \frac{7 \times 10}{100} \) = \( \frac{70}{100} \) = 0.7 errors per hour
So, in an average hour, the machine will produce 10 - 0.7 = 9.3 error free parts.
The machine ran for 24 - 2 = 22 hours yesterday so you would expect that 22 x 9.3 = 204.6 error free parts were produced yesterday.
a(b + c) = ab + ac defines which of the following?
commutative property for multiplication |
|
distributive property for division |
|
commutative property for division |
|
distributive property for multiplication |
The distributive property for multiplication helps in solving expressions like a(b + c). It specifies that the result of multiplying one number by the sum or difference of two numbers can be obtained by multiplying each number individually and then totaling the results: a(b + c) = ab + ac. For example, 4(10-5) = (4 x 10) - (4 x 5) = 40 - 20 = 20.