| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.09 |
| Score | 0% | 62% |
If there were a total of 50 raffle tickets sold and you bought 3 tickets, what's the probability that you'll win the raffle?
| 11% | |
| 10% | |
| 13% | |
| 7% |
You have 3 out of the total of 50 raffle tickets sold so you have a (\( \frac{3}{50} \)) x 100 = \( \frac{3 \times 100}{50} \) = \( \frac{300}{50} \) = 7% chance to win the raffle.
Solve 5 + (4 + 3) ÷ 4 x 2 - 32
| 1\(\frac{1}{7}\) | |
| -\(\frac{1}{2}\) | |
| 1 | |
| \(\frac{1}{3}\) |
Use PEMDAS (Parentheses, Exponents, Multipy/Divide, Add/Subtract):
5 + (4 + 3) ÷ 4 x 2 - 32
P: 5 + (7) ÷ 4 x 2 - 32
E: 5 + 7 ÷ 4 x 2 - 9
MD: 5 + \( \frac{7}{4} \) x 2 - 9
MD: 5 + \( \frac{14}{4} \) - 9
AS: \( \frac{20}{4} \) + \( \frac{14}{4} \) - 9
AS: \( \frac{34}{4} \) - 9
AS: \( \frac{34 - 36}{4} \)
\( \frac{-2}{4} \)
-\(\frac{1}{2}\)
What is -5a2 + a2?
| -6a2 | |
| -6a-2 | |
| -4a4 | |
| -4a2 |
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:
-5a2 + 1a2
(-5 + 1)a2
-4a2
A menswear store is having a sale: "Buy one shirt at full price and get another shirt for 5% off." If Monty buys two shirts, each with a regular price of $41, how much will he pay for both shirts?
| $51.25 | |
| $79.95 | |
| $55.35 | |
| $38.95 |
By buying two shirts, Monty will save $41 x \( \frac{5}{100} \) = \( \frac{$41 x 5}{100} \) = \( \frac{$205}{100} \) = $2.05 on the second shirt.
So, his total cost will be
$41.00 + ($41.00 - $2.05)
$41.00 + $38.95
$79.95
Find the average of the following numbers: 9, 7, 12, 4.
| 12 | |
| 6 | |
| 13 | |
| 8 |
To find the average of these 4 numbers add them together then divide by 4:
\( \frac{9 + 7 + 12 + 4}{4} \) = \( \frac{32}{4} \) = 8