| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.00 |
| Score | 0% | 60% |
a(b + c) = ab + ac defines which of the following?
commutative property for division |
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commutative property for multiplication |
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distributive property for division |
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distributive 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 60% larger than the original. By what percentage has the area of the logo increased?
| 20% | |
| 30% | |
| 27\(\frac{1}{2}\)% | |
| 17\(\frac{1}{2}\)% |
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 60% the radius (and, consequently, the total area) increases by \( \frac{60\text{%}}{2} \) = 30%
What is \( 9 \)\( \sqrt{32} \) - \( 8 \)\( \sqrt{2} \)
| \( \sqrt{16} \) | |
| 72\( \sqrt{32} \) | |
| \( \sqrt{-12} \) | |
| 28\( \sqrt{2} \) |
To subtract these radicals together their radicands must be the same:
9\( \sqrt{32} \) - 8\( \sqrt{2} \)
9\( \sqrt{16 \times 2} \) - 8\( \sqrt{2} \)
9\( \sqrt{4^2 \times 2} \) - 8\( \sqrt{2} \)
(9)(4)\( \sqrt{2} \) - 8\( \sqrt{2} \)
36\( \sqrt{2} \) - 8\( \sqrt{2} \)
Now that the radicands are identical, you can subtract them:
36\( \sqrt{2} \) - 8\( \sqrt{2} \)Ezra loaned Monty $200 at an annual interest rate of 3%. If no payments are made, what is the interest owed on this loan at the end of the first year?
| $6 | |
| $2 | |
| $32 | |
| $3 |
The yearly interest charged on this loan is the annual interest rate multiplied by the amount borrowed:
interest = annual interest rate x loan amount
i = (\( \frac{6}{100} \)) x $200
i = 0.03 x $200
i = $6
If \( \left|y - 3\right| \) + 9 = 1, which of these is a possible value for y?
| 6 | |
| 19 | |
| 3 | |
| 11 |
First, solve for \( \left|y - 3\right| \):
\( \left|y - 3\right| \) + 9 = 1
\( \left|y - 3\right| \) = 1 - 9
\( \left|y - 3\right| \) = -8
The value inside the absolute value brackets can be either positive or negative so (y - 3) must equal - 8 or --8 for \( \left|y - 3\right| \) to equal -8:
| y - 3 = -8 y = -8 + 3 y = -5 | y - 3 = 8 y = 8 + 3 y = 11 |
So, y = 11 or y = -5.