| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.91 |
| Score | 0% | 58% |
What is \( \frac{-6b^5}{1b^2} \)?
| -6b10 | |
| -\(\frac{1}{6}\)b3 | |
| -6b3 | |
| -6b2\(\frac{1}{2}\) |
To divide terms with exponents, the base of both exponents must be the same. In this case they are so divide the coefficients and subtract the exponents:
\( \frac{-6b^5}{b^2} \)
\( \frac{-6}{1} \) b(5 - 2)
-6b3
If \( \left|b + 1\right| \) - 6 = 8, which of these is a possible value for b?
| -15 | |
| 8 | |
| -21 | |
| 0 |
First, solve for \( \left|b + 1\right| \):
\( \left|b + 1\right| \) - 6 = 8
\( \left|b + 1\right| \) = 8 + 6
\( \left|b + 1\right| \) = 14
The value inside the absolute value brackets can be either positive or negative so (b + 1) must equal + 14 or -14 for \( \left|b + 1\right| \) to equal 14:
| b + 1 = 14 b = 14 - 1 b = 13 | b + 1 = -14 b = -14 - 1 b = -15 |
So, b = -15 or b = 13.
What is \( \frac{2}{8} \) ÷ \( \frac{1}{7} \)?
| \(\frac{1}{5}\) | |
| 1\(\frac{3}{4}\) | |
| \(\frac{1}{21}\) | |
| \(\frac{8}{45}\) |
To divide fractions, invert the second fraction and then multiply:
\( \frac{2}{8} \) ÷ \( \frac{1}{7} \) = \( \frac{2}{8} \) x \( \frac{7}{1} \)
To multiply fractions, multiply the numerators together and then multiply the denominators together:
\( \frac{2}{8} \) x \( \frac{7}{1} \) = \( \frac{2 x 7}{8 x 1} \) = \( \frac{14}{8} \) = 1\(\frac{3}{4}\)
\({b + c \over a} = {b \over a} + {c \over a}\) defines which of the following?
commutative property for multiplication |
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distributive property for division |
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distributive property for multiplication |
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commutative property for division |
The distributive property for division helps in solving expressions like \({b + c \over a}\). It specifies that the result of dividing a fraction with multiple terms in the numerator and one term in the denominator can be obtained by dividing each term individually and then totaling the results: \({b + c \over a} = {b \over a} + {c \over a}\). For example, \({a^3 + 6a^2 \over a^2} = {a^3 \over a^2} + {6a^2 \over a^2} = a + 6\).
Which of the following statements about exponents is false?
b1 = b |
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b1 = 1 |
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all of these are false |
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b0 = 1 |
A number with an exponent (be) consists of a base (b) raised to a power (e). The exponent indicates the number of times that the base is multiplied by itself. A base with an exponent of 1 equals the base (b1 = b) and a base with an exponent of 0 equals 1 ( (b0 = 1).