| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.12 |
| Score | 0% | 62% |
Roger loaned April $1,000 at an annual interest rate of 8%. If no payments are made, what is the total amount owed at the end of the first year?
| $1,060 | |
| $1,080 | |
| $1,090 | |
| $1,010 |
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 $1,000
i = 0.08 x $1,000
No payments were made so the total amount due is the original amount + the accumulated interest:
total = $1,000 + $80Find the average of the following numbers: 19, 11, 16, 14.
| 13 | |
| 16 | |
| 15 | |
| 12 |
To find the average of these 4 numbers add them together then divide by 4:
\( \frac{19 + 11 + 16 + 14}{4} \) = \( \frac{60}{4} \) = 15
A menswear store is having a sale: "Buy one shirt at full price and get another shirt for 20% off." If Alex buys two shirts, each with a regular price of $48, how much will he pay for both shirts?
| $57.60 | |
| $67.20 | |
| $9.60 | |
| $86.40 |
By buying two shirts, Alex will save $48 x \( \frac{20}{100} \) = \( \frac{$48 x 20}{100} \) = \( \frac{$960}{100} \) = $9.60 on the second shirt.
So, his total cost will be
$48.00 + ($48.00 - $9.60)
$48.00 + $38.40
$86.40
What is 7c5 x 9c3?
| 16c3 | |
| 63c3 | |
| 63c8 | |
| 16c5 |
To multiply terms with exponents, the base of both exponents must be the same. In this case they are so multiply the coefficients and add the exponents:
7c5 x 9c3
(7 x 9)c(5 + 3)
63c8
What is \( 3 \)\( \sqrt{8} \) + \( 7 \)\( \sqrt{2} \)
| 21\( \sqrt{16} \) | |
| 13\( \sqrt{2} \) | |
| 10\( \sqrt{16} \) | |
| 10\( \sqrt{2} \) |
To add these radicals together their radicands must be the same:
3\( \sqrt{8} \) + 7\( \sqrt{2} \)
3\( \sqrt{4 \times 2} \) + 7\( \sqrt{2} \)
3\( \sqrt{2^2 \times 2} \) + 7\( \sqrt{2} \)
(3)(2)\( \sqrt{2} \) + 7\( \sqrt{2} \)
6\( \sqrt{2} \) + 7\( \sqrt{2} \)
Now that the radicands are identical, you can add them together:
6\( \sqrt{2} \) + 7\( \sqrt{2} \)