| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.11 |
| Score | 0% | 62% |
If \( \left|x - 5\right| \) + 6 = 2, which of these is a possible value for x?
| 10 | |
| 5 | |
| 18 | |
| 9 |
First, solve for \( \left|x - 5\right| \):
\( \left|x - 5\right| \) + 6 = 2
\( \left|x - 5\right| \) = 2 - 6
\( \left|x - 5\right| \) = -4
The value inside the absolute value brackets can be either positive or negative so (x - 5) must equal - 4 or --4 for \( \left|x - 5\right| \) to equal -4:
| x - 5 = -4 x = -4 + 5 x = 1 | x - 5 = 4 x = 4 + 5 x = 9 |
So, x = 9 or x = 1.
Which of the following is an improper fraction?
\({2 \over 5} \) |
|
\(1 {2 \over 5} \) |
|
\({7 \over 5} \) |
|
\({a \over 5} \) |
A rational number (or fraction) is represented as a ratio between two integers, a and b, and has the form \({a \over b}\) where a is the numerator and b is the denominator. An improper fraction (\({5 \over 3} \)) has a numerator with a greater absolute value than the denominator and can be converted into a mixed number (\(1 {2 \over 3} \)) which has a whole number part and a fractional part.
A sports card collection contains football, baseball, and basketball cards. If the ratio of football to baseball cards is 5 to 2 and the ratio of baseball to basketball cards is 5 to 1, what is the ratio of football to basketball cards?
| 9:2 | |
| 1:1 | |
| 3:6 | |
| 25:2 |
The ratio of football cards to baseball cards is 5:2 and the ratio of baseball cards to basketball cards is 5:1. 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 25:10 and the ratio of baseball cards to basketball cards as 10:2. So, the ratio of football cards to basketball cards is football:baseball, baseball:basketball or 25:10, 10:2 which reduces to 25:2.
Convert x-2 to remove the negative exponent.
| \( \frac{-1}{-2x^{2}} \) | |
| \( \frac{1}{x^{-2}} \) | |
| \( \frac{1}{x^2} \) | |
| \( \frac{-1}{-2x} \) |
To convert a negative exponent to a positive exponent, calculate the positive exponent then take the reciprocal.
A tiger in a zoo has consumed 48 pounds of food in 6 days. If the tiger continues to eat at the same rate, in how many more days will its total food consumtion be 72 pounds?
| 3 | |
| 6 | |
| 9 | |
| 8 |
If the tiger has consumed 48 pounds of food in 6 days that's \( \frac{48}{6} \) = 8 pounds of food per day. The tiger needs to consume 72 - 48 = 24 more pounds of food to reach 72 pounds total. At 8 pounds of food per day that's \( \frac{24}{8} \) = 3 more days.