| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.84 |
| Score | 0% | 57% |
a(b + c) = ab + ac defines which of the following?
distributive property for division |
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commutative property for division |
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distributive property for multiplication |
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commutative property for multiplication |
The distributive property for multiplication helps in solving expressions like a(b + c). It specifies that the result of multiplying one number by the sum or difference of two numbers can be obtained by multiplying each number individually and then totaling the results: a(b + c) = ab + ac. For example, 4(10-5) = (4 x 10) - (4 x 5) = 40 - 20 = 20.
A circular logo is enlarged to fit the lid of a jar. The new diameter is 35% larger than the original. By what percentage has the area of the logo increased?
| 17\(\frac{1}{2}\)% | |
| 35% | |
| 25% | |
| 20% |
The area of a circle is given by the formula A = πr2 where r is the radius of the circle. The radius of a circle is its diameter divided by two so A = π(\( \frac{d}{2} \))2. If the diameter of the logo increases by 35% the radius (and, consequently, the total area) increases by \( \frac{35\text{%}}{2} \) = 17\(\frac{1}{2}\)%
What is 4\( \sqrt{9} \) x 6\( \sqrt{8} \)?
| 144\( \sqrt{2} \) | |
| 10\( \sqrt{8} \) | |
| 10\( \sqrt{72} \) | |
| 24\( \sqrt{9} \) |
To multiply terms with radicals, multiply the coefficients and radicands separately:
4\( \sqrt{9} \) x 6\( \sqrt{8} \)
(4 x 6)\( \sqrt{9 \times 8} \)
24\( \sqrt{72} \)
Now we need to simplify the radical:
24\( \sqrt{72} \)
24\( \sqrt{2 \times 36} \)
24\( \sqrt{2 \times 6^2} \)
(24)(6)\( \sqrt{2} \)
144\( \sqrt{2} \)
If the ratio of home fans to visiting fans in a crowd is 3:1 and all 35,000 seats in a stadium are filled, how many home fans are in attendance?
| 24,000 | |
| 26,250 | |
| 31,667 | |
| 35,200 |
A ratio of 3:1 means that there are 3 home fans for every one visiting fan. So, of every 4 fans, 3 are home fans and \( \frac{3}{4} \) of every fan in the stadium is a home fan:
35,000 fans x \( \frac{3}{4} \) = \( \frac{105000}{4} \) = 26,250 fans.
The __________ is the greatest factor that divides two integers.
absolute value |
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least common multiple |
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greatest common factor |
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greatest common multiple |
The greatest common factor (GCF) is the greatest factor that divides two integers.