| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.67 |
| Score | 0% | 73% |
A menswear store is having a sale: "Buy one shirt at full price and get another shirt for 45% off." If Alex buys two shirts, each with a regular price of $35, how much will he pay for both shirts?
| $50.75 | |
| $19.25 | |
| $45.50 | |
| $54.25 |
By buying two shirts, Alex will save $35 x \( \frac{45}{100} \) = \( \frac{$35 x 45}{100} \) = \( \frac{$1575}{100} \) = $15.75 on the second shirt.
So, his total cost will be
$35.00 + ($35.00 - $15.75)
$35.00 + $19.25
$54.25
How many hours does it take a car to travel 480 miles at an average speed of 60 miles per hour?
| 1 hour | |
| 8 hours | |
| 9 hours | |
| 6 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 = \( \frac{480mi}{60mph} \)
8 hours
If \(\left|a\right| = 7\), which of the following best describes a?
none of these is correct |
|
a = -7 |
|
a = 7 |
|
a = 7 or 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).
If a car travels 120 miles in 2 hours, what is the average speed?
| 60 mph | |
| 30 mph | |
| 55 mph | |
| 45 mph |
Average speed in miles per hour is the number of miles traveled divided by the number of hours:
speed = \( \frac{\text{distance}}{\text{time}} \)Bob loaned Ezra $1,200 at an annual interest rate of 7%. If no payments are made, what is the interest owed on this loan at the end of the first year?
| $20 | |
| $99 | |
| $104 | |
| $84 |
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 $1,200
i = 0.07 x $1,200
i = $84