| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.71 |
| Score | 0% | 74% |
A menswear store is having a sale: "Buy one shirt at full price and get another shirt for 30% off." If Roger buys two shirts, each with a regular price of $43, how much money will he save?
| $10.75 | |
| $21.50 | |
| $2.15 | |
| $12.90 |
By buying two shirts, Roger will save $43 x \( \frac{30}{100} \) = \( \frac{$43 x 30}{100} \) = \( \frac{$1290}{100} \) = $12.90 on the second shirt.
If \( \left|b - 4\right| \) - 7 = 4, which of these is a possible value for b?
| -5 | |
| -7 | |
| -1 | |
| -9 |
First, solve for \( \left|b - 4\right| \):
\( \left|b - 4\right| \) - 7 = 4
\( \left|b - 4\right| \) = 4 + 7
\( \left|b - 4\right| \) = 11
The value inside the absolute value brackets can be either positive or negative so (b - 4) must equal + 11 or -11 for \( \left|b - 4\right| \) to equal 11:
| b - 4 = 11 b = 11 + 4 b = 15 | b - 4 = -11 b = -11 + 4 b = -7 |
So, b = -7 or b = 15.
Which of the following is a mixed number?
\({a \over 5} \) |
|
\({5 \over 7} \) |
|
\(1 {2 \over 5} \) |
|
\({7 \over 5} \) |
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.
What is -6a5 + 3a5?
| 9a5 | |
| -3a5 | |
| -9a-5 | |
| 9a-5 |
To add or subtract terms with exponents, both the base and the exponent must be the same. In this case they are so add the coefficients and retain the base and exponent:
-6a5 + 3a5
(-6 + 3)a5
-3a5
What is the next number in this sequence: 1, 5, 9, 13, 17, __________ ?
| 21 | |
| 18 | |
| 20 | |
| 15 |
The equation for this sequence is:
an = an-1 + 4
where n is the term's order in the sequence, an is the value of the term, and an-1 is the value of the term before an. This makes the next number:
a6 = a5 + 4
a6 = 17 + 4
a6 = 21