| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.77 |
| Score | 0% | 75% |
What is 6a + 2a?
| 8a | |
| 12a2 | |
| 8 | |
| a2 |
To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.
6a + 2a = 8a
If side x = 7cm, side y = 9cm, and side z = 7cm what is the perimeter of this triangle?
| 26cm | |
| 27cm | |
| 23cm | |
| 36cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 7cm + 9cm + 7cm = 23cm
Which of the following statements about math operations is incorrect?
you can add monomials that have the same variable and the same exponent |
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you can subtract monomials that have the same variable and the same exponent |
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you can multiply monomials that have different variables and different exponents |
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all of these statements are correct |
You can only add or subtract monomials that have the same variable and the same exponent. For example, 2a + 4a = 6a and 4a2 - a2 = 3a2 but 2a + 4b and 7a - 3b cannot be combined. However, you can multiply and divide monomials with unlike terms. For example, 2a x 6b = 12ab.
What is the area of a circle with a diameter of 8?
| 16π | |
| 81π | |
| 4π | |
| 6π |
The formula for area is πr2. Radius is circle \( \frac{diameter}{2} \):
r = \( \frac{d}{2} \)
r = \( \frac{8}{2} \)
r = 4
a = πr2
a = π(42)
a = 16π
A trapezoid is a quadrilateral with one set of __________ sides.
right angle |
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equal length |
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equal angle |
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parallel |
A trapezoid is a quadrilateral with one set of parallel sides.