| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.91 |
| Score | 0% | 78% |
What is -y3 - 9y3?
| 10y-3 | |
| 8y3 | |
| -10y3 | |
| -10y-3 |
To add or subtract terms with exponents, both the base and the exponent must be the same. In this case they are so subtract the coefficients and retain the base and exponent:
-1y3 - 9y3
(-1 - 9)y3
-10y3
What is -z3 x 5z6?
| 4z9 | |
| 4z3 | |
| 4z18 | |
| -5z9 |
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:
-z3 x 5z6
(-1 x 5)z(3 + 6)
-5z9
Find the average of the following numbers: 16, 14, 19, 11.
| 17 | |
| 14 | |
| 20 | |
| 15 |
To find the average of these 4 numbers add them together then divide by 4:
\( \frac{16 + 14 + 19 + 11}{4} \) = \( \frac{60}{4} \) = 15
4! = ?
3 x 2 x 1 |
|
4 x 3 |
|
4 x 3 x 2 x 1 |
|
5 x 4 x 3 x 2 x 1 |
A factorial has the form n! and is the product of the integer (n) and all the positive integers below it. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120.
If a car travels 70 miles in 2 hours, what is the average speed?
| 35 mph | |
| 60 mph | |
| 20 mph | |
| 25 mph |
Average speed in miles per hour is the number of miles traveled divided by the number of hours:
speed = \( \frac{\text{distance}}{\text{time}} \)