| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.84 |
| Score | 0% | 77% |
Simplify 8a x 4b.
| 32\( \frac{a}{b} \) | |
| 32ab | |
| 32\( \frac{b}{a} \) | |
| 32a2b2 |
To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.
8a x 4b = (8 x 4) (a x b) = 32ab
Which of the following statements about math operations is incorrect?
you can multiply monomials that have different variables and different exponents |
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you can subtract monomials that have the same variable and the same exponent |
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you can add monomials that have the same variable and the same exponent |
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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 circumference of a circle with a radius of 17?
| 1π | |
| 28π | |
| 34π | |
| 4π |
The formula for circumference is circle diameter x π. Circle diameter is 2 x radius:
c = πd
c = π(2 * r)
c = π(2 * 17)
c = 34π
If side x = 15cm, side y = 13cm, and side z = 12cm what is the perimeter of this triangle?
| 25cm | |
| 31cm | |
| 33cm | |
| 40cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 15cm + 13cm + 12cm = 40cm
A trapezoid is a quadrilateral with one set of __________ sides.
equal length |
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equal angle |
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right angle |
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parallel |
A trapezoid is a quadrilateral with one set of parallel sides.