| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.52 |
| Score | 0% | 70% |
4! = ?
5 x 4 x 3 x 2 x 1 |
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3 x 2 x 1 |
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4 x 3 x 2 x 1 |
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4 x 3 |
A factorial has the form n! and is the product of the integer (n) and all the positive integers below it. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120.
Convert 0.000432 to scientific notation.
| 4.32 x 10-4 | |
| 4.32 x 105 | |
| 43.2 x 10-5 | |
| 4.32 x 10-3 |
A number in scientific notation has the format 0.000 x 10exponent. To convert to scientific notation, move the decimal point to the right or the left until the number is a decimal between 1 and 10. The exponent of the 10 is the number of places you moved the decimal point and is positive if you moved the decimal point to the left and negative if you moved it to the right:
0.000432 in scientific notation is 4.32 x 10-4
The __________ is the smallest positive integer that is a multiple of two or more integers.
least common multiple |
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greatest common factor |
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least common factor |
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absolute value |
The least common multiple (LCM) is the smallest positive integer that is a multiple of two or more integers.
If \(\left|a\right| = 7\), which of the following best describes a?
a = 7 |
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a = 7 or a = -7 |
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none of these is correct |
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a = -7 |
The absolute value is the positive magnitude of a particular number or variable and is indicated by two vertical lines: \(\left|-5\right| = 5\). In the case of a variable absolute value (\(\left|a\right| = 5\)) the value of a can be either positive or negative (a = -5 or a = 5).
How many hours does it take a car to travel 120 miles at an average speed of 20 miles per hour?
| 6 hours | |
| 7 hours | |
| 8 hours | |
| 3 hours |
Average speed in miles per hour is the number of miles traveled divided by the number of hours:
speed = \( \frac{\text{distance}}{\text{time}} \)Solving for time:
time = \( \frac{\text{distance}}{\text{speed}} \)
time = \( \frac{120mi}{20mph} \)
6 hours