| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.48 |
| Score | 0% | 70% |
If \(\left|a\right| = 7\), which of the following best describes a?
none of these is correct |
|
a = -7 |
|
a = 7 or a = -7 |
|
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 the distance in miles of a trip that takes 5 hours at an average speed of 75 miles per hour?
| 150 miles | |
| 100 miles | |
| 75 miles | |
| 375 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 = \( 75mph \times 5h \)
375 miles
What is \( \frac{4a^7}{7a^4} \)?
| \(\frac{4}{7}\)a1\(\frac{3}{4}\) | |
| \(\frac{4}{7}\)a11 | |
| \(\frac{4}{7}\)a\(\frac{4}{7}\) | |
| \(\frac{4}{7}\)a3 |
To divide terms with exponents, the base of both exponents must be the same. In this case they are so divide the coefficients and subtract the exponents:
\( \frac{4a^7}{7a^4} \)
\( \frac{4}{7} \) a(7 - 4)
\(\frac{4}{7}\)a3
Bob loaned Frank $900 at an annual interest rate of 1%. If no payments are made, what is the interest owed on this loan at the end of the first year?
| $84 | |
| $30 | |
| $9 | |
| $48 |
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 $900
i = 0.01 x $900
i = $9
A bread recipe calls for 3\(\frac{5}{8}\) cups of flour. If you only have 1\(\frac{1}{2}\) cups, how much more flour is needed?
| 2\(\frac{1}{8}\) cups | |
| \(\frac{1}{4}\) cups | |
| 1\(\frac{3}{4}\) cups | |
| 1\(\frac{7}{8}\) cups |
The amount of flour you need is (3\(\frac{5}{8}\) - 1\(\frac{1}{2}\)) cups. Rewrite the quantities so they share a common denominator and subtract:
(\( \frac{29}{8} \) - \( \frac{12}{8} \)) cups
\( \frac{17}{8} \) cups
2\(\frac{1}{8}\) cups