| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.17 |
| Score | 0% | 63% |
A sports card collection contains football, baseball, and basketball cards. If the ratio of football to baseball cards is 3 to 2 and the ratio of baseball to basketball cards is 3 to 1, what is the ratio of football to basketball cards?
| 7:4 | |
| 9:1 | |
| 5:2 | |
| 9:2 |
The ratio of football cards to baseball cards is 3:2 and the ratio of baseball cards to basketball cards is 3:1. To solve this problem, we need the baseball card side of each ratio to be equal so we need to rewrite the ratios in terms of a common number of baseball cards. (Think of this like finding the common denominator when adding fractions.) The ratio of football to baseball cards can also be written as 9:6 and the ratio of baseball cards to basketball cards as 6:2. So, the ratio of football cards to basketball cards is football:baseball, baseball:basketball or 9:6, 6:2 which reduces to 9:2.
a(b + c) = ab + ac defines which of the following?
commutative property for multiplication |
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commutative property for division |
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distributive property for division |
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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.
Which of these numbers is a factor of 24?
| 15 | |
| 11 | |
| 14 | |
| 1 |
The factors of a number are all positive integers that divide evenly into the number. The factors of 24 are 1, 2, 3, 4, 6, 8, 12, 24.
What is \( 3 \)\( \sqrt{50} \) + \( 2 \)\( \sqrt{2} \)
| 17\( \sqrt{2} \) | |
| 6\( \sqrt{2} \) | |
| 6\( \sqrt{100} \) | |
| 5\( \sqrt{100} \) |
To add these radicals together their radicands must be the same:
3\( \sqrt{50} \) + 2\( \sqrt{2} \)
3\( \sqrt{25 \times 2} \) + 2\( \sqrt{2} \)
3\( \sqrt{5^2 \times 2} \) + 2\( \sqrt{2} \)
(3)(5)\( \sqrt{2} \) + 2\( \sqrt{2} \)
15\( \sqrt{2} \) + 2\( \sqrt{2} \)
Now that the radicands are identical, you can add them together:
15\( \sqrt{2} \) + 2\( \sqrt{2} \)What is the distance in miles of a trip that takes 3 hours at an average speed of 75 miles per hour?
| 225 miles | |
| 140 miles | |
| 275 miles | |
| 200 miles |
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 distance:
distance = \( \text{speed} \times \text{time} \)
distance = \( 75mph \times 3h \)
225 miles