| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.86 |
| Score | 0% | 57% |
On average, the center for a basketball team hits 45% of his shots while a guard on the same team hits 65% of his shots. If the guard takes 15 shots during a game, how many shots will the center have to take to score as many points as the guard assuming each shot is worth the same number of points?
| 17 | |
| 43 | |
| 20 | |
| 18 |
guard shots made = shots taken x \( \frac{\text{% made}}{100} \) = 15 x \( \frac{65}{100} \) = \( \frac{65 x 15}{100} \) = \( \frac{975}{100} \) = 9 shots
The center makes 45% of his shots so he'll have to take:
shots made = shots taken x \( \frac{\text{% made}}{100} \)
shots taken = \( \frac{\text{shots taken}}{\frac{\text{% made}}{100}} \)
to make as many shots as the guard. Plugging in values for the center gives us:
center shots taken = \( \frac{9}{\frac{45}{100}} \) = 9 x \( \frac{100}{45} \) = \( \frac{9 x 100}{45} \) = \( \frac{900}{45} \) = 20 shots
to make the same number of shots as the guard and thus score the same number of points.
What is 7\( \sqrt{2} \) x 2\( \sqrt{2} \)?
| 14\( \sqrt{2} \) | |
| 14\( \sqrt{4} \) | |
| 28 | |
| 9\( \sqrt{4} \) |
To multiply terms with radicals, multiply the coefficients and radicands separately:
7\( \sqrt{2} \) x 2\( \sqrt{2} \)
(7 x 2)\( \sqrt{2 \times 2} \)
14\( \sqrt{4} \)
Now we need to simplify the radical:
14\( \sqrt{4} \)
14\( \sqrt{2^2} \)
(14)(2)
28
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).
What is -b7 - 9b7?
| 8b49 | |
| -10b7 | |
| -10b-7 | |
| 8b-14 |
To add or subtract terms with exponents, both the base and the exponent must be the same. In this case they are so subtract the coefficients and retain the base and exponent:
-1b7 - 9b7
(-1 - 9)b7
-10b7
In a class of 25 students, 5 are taking German and 11 are taking Spanish. Of the students studying German or Spanish, 5 are taking both courses. How many students are not enrolled in either course?
| 14 | |
| 24 | |
| 18 | |
| 11 |
The number of students taking German or Spanish is 5 + 11 = 16. Of that group of 16, 5 are taking both languages so they've been counted twice (once in the German group and once in the Spanish group). Subtracting them out leaves 16 - 5 = 11 who are taking at least one language. 25 - 11 = 14 students who are not taking either language.