| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.11 |
| Score | 0% | 62% |
Convert y-4 to remove the negative exponent.
| \( \frac{4}{y} \) | |
| \( \frac{1}{y^4} \) | |
| \( \frac{-1}{-4y} \) | |
| \( \frac{-1}{y^{-4}} \) |
To convert a negative exponent to a positive exponent, calculate the positive exponent then take the reciprocal.
A sports card collection contains football, baseball, and basketball cards. If the ratio of football to baseball cards is 7 to 2 and the ratio of baseball to basketball cards is 7 to 1, what is the ratio of football to basketball cards?
| 5:8 | |
| 1:6 | |
| 3:1 | |
| 49:2 |
The ratio of football cards to baseball cards is 7:2 and the ratio of baseball cards to basketball cards is 7:1. 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 49:14 and the ratio of baseball cards to basketball cards as 14:2. So, the ratio of football cards to basketball cards is football:baseball, baseball:basketball or 49:14, 14:2 which reduces to 49:2.
| 3.2 | |
| 5.6 | |
| 1.2 | |
| 1 |
1
If \( \left|x + 1\right| \) - 2 = 3, which of these is a possible value for x?
| 14 | |
| -2 | |
| -11 | |
| 4 |
First, solve for \( \left|x + 1\right| \):
\( \left|x + 1\right| \) - 2 = 3
\( \left|x + 1\right| \) = 3 + 2
\( \left|x + 1\right| \) = 5
The value inside the absolute value brackets can be either positive or negative so (x + 1) must equal + 5 or -5 for \( \left|x + 1\right| \) to equal 5:
| x + 1 = 5 x = 5 - 1 x = 4 | x + 1 = -5 x = -5 - 1 x = -6 |
So, x = -6 or x = 4.
Ezra loaned Monty $1,400 at an annual interest rate of 5%. If no payments are made, what is the interest owed on this loan at the end of the first year?
| $54 | |
| $10 | |
| $70 | |
| $14 |
The yearly interest charged on this loan is the annual interest rate multiplied by the amount borrowed:
interest = annual interest rate x loan amount
i = (\( \frac{6}{100} \)) x $1,400
i = 0.05 x $1,400
i = $70