Please Remember To Show All Your Work On Every Problem
Please Remember To Show All Of Your Work On Every Problem If There I
Please remember to show ALL of your work on every problem. If there is no work to show, then include a sentence or two explaining your answer. Here are the basic rules of showing work: · Each step should show the complete expression or equation rather than a piece of it. · Each new step should follow logically from the previous step, following rules of algebra. · Each new step should be beneath the previous step. · The equal sign, =, should only connect equal numbers or expressions.
Paper For Above instruction
The following is a comprehensive solution to the given mathematics problems, demonstrating detailed work and explanations to ensure clarity and accuracy, adhering to the instructions for showing all work for each problem.
1a. Which of the following represents the distance between -12.4 and –6.9 on the number line? Indicate your choice.
To find the distance between two points on the number line, we take the absolute value of their difference. Specifically, the distance between -12.4 and -6.9 is |(-12.4) - (-6.9)|, which simplifies to | -12.4 + 6.9 |.
Calculating:
| -12.4 + 6.9 | = | -5.5 | = 5.5
Among the options:
- A. | -12.4 | + | -6.9 | = 12.4 + 6.9 = 19.3
- B. | -6.9 - 12.4 | = | -19.3 | = 19.3
- C. | -12.4 + 6.9 | = | -5.5 | = 5.5
- D. | -6.9 | – | -12.4 | = 6.9 – 12.4 = -5.5 (absolute value 5.5, but as written, this is not in correct form)
The correct choice is C, since it reflects the absolute value of the difference and equals 5.5.
1b. Find the distance. Show your work.
Based on the previous calculation, the distance between -12.4 and -6.9 is:
Distance = | -12.4 - (–6.9) | = | -12.4 + 6.9 | = | -5.5 | = 5.5
2. Write the interval notation corresponding to the set { x | x ≤ – 4}.
The set { x | x ≤ – 4 } includes all real numbers less than or equal to -4. In interval notation, this is written as:
(-∞, – 4]
3. Consider the interval (– , 0]. For each numerical value below, is it in the interval or not? (Just answer Yes or No)
Note: The interval is (–∞, 0].
- -7.1: Yes, because -7.1
- 10: No, because 10 > 0
- -3: Yes, because -3 ≤ 0
- -10: No, because -10 –∞ and ≤ 0; yes, because -10 is finite and less than or equal to 0, so Yes)
- -0.09: Yes, because -0.09 ≤ 0
- -32: No, because -32
- -4: Yes, because -4 ≤ 0 and included in the interval
- 2: No, because 2 > 0
- -1.5: Yes, because -1.5 ≤ 0
- 4.2: No, because 4.2 > 0
4. Simplify \(\frac{3x^2 y^{-3}}{6x^{-1} y^2}\). Show work.
Starting expression:
\(\frac{3x^2 y^{-3}}{6x^{-1} y^2}\)
Step 1: Simplify coefficients:
\(\frac{3}{6} = \frac{1}{2}\)
Step 2: Use laws of exponents for \(x\):
\(x^{2} / x^{-1} = x^{2 - (-1)} = x^{2 + 1} = x^{3}\)
Step 3: Use laws of exponents for \(y\):
\(y^{-3} / y^{2} = y^{-3 - 2} = y^{-5}\)
Final simplified form:
\(\frac{1}{2} x^{3} y^{-5}\)
Rewrite with positive exponents:
\(\frac{1}{2} \frac{x^{3}}{ y^{5} }\)
5. Simplify \(\frac{(2x^3 y^{-2})^2}{4x^4 y^{-4}}\). Show work.
Starting with numerator:
\((2x^3 y^{-2})^2 = 2^2 \times x^{3 \times 2} \times y^{-2 \times 2} = 4 x^{6} y^{-4}\)
Now, write the entire expression:
\(\frac{4 x^{6} y^{-4}}{4 x^{4} y^{-4}}\)
Cancel common factors in numerator and denominator:
Coefficients: 4/4 = 1
For \(x\): \(x^{6} / x^{4} = x^{6-4} = x^{2}\)
For \(y\): \(y^{-4} / y^{-4} = y^{0} = 1\)
Final answer:
\(x^{2}\)
6. Compute \( (3 \times 10^4) \times (4 \times 10^3) \). Show some work. Write answer in scientific notation.
Multiply coefficients: \(3 \times 4 = 12\)
Add exponents: \(10^4 \times 10^3 = 10^{4+3} = 10^{7}\)
Combine:
12 × 10^{7}
Express in correct scientific notation:
1.2 × 10^{8}
7. Factor each expression (Work not required to be shown):
- a) \(x^2 - 9\): This is a difference of squares:
- \( (x - 3)(x + 3) \)
- b) \(6x^3 + 3x^2\): Factor out common factor 3x^2:
- \( 3x^2 (2x + 1) \)
- c) \(x^3 + 3x^2 + 2x\): Factor out \(x\) first:
- \( x (x^2 + 3x + 2) \), then factor quadratic:
- \( x (x+1)(x+2) \)
8. Perform the indicated operations and simplify: \( (2x^3 y)^2 \). Show work.
Square the entire expression:
\( (2x^3 y)^2 = 2^2 \times (x^3)^2 \times y^2 = 4 x^{6} y^2 \)
9. Solve the equation \( 3x - 7 = 2x + 4 \). Show work.
Subtract \(2x\) from both sides:
\(3x - 2x -7 = 4\)
Simplify:
\(x - 7 = 4\)
Add 7 to both sides:
\(x = 4 + 7 = 11\)
10. Solve the equation \( x/3 + 2 = 5 \). Show work.
Subtract 2 from both sides:
\( x/3 = 3 \)
Multiply both sides by 3:
\( x = 3 \times 3 = 9 \)
11. Simplify: \(\sqrt{50}\). Show work.
Express 50 as product of perfect square and remaining factor:
50 = 25 × 2
Thus,
\(\sqrt{50} = \sqrt{25 \times 2} = \sqrt{25} \times \sqrt{2} = 5 \sqrt{2}\)
12. Simplify: \(\frac{\sqrt{18}}{\sqrt{2}}\). Show work.
Write as a single radical:
\(\sqrt{18} / \sqrt{2} = \sqrt{18 / 2} = \sqrt{9} = 3\)
References
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- Rappaport, R. (2014). Algebra and Trigonometry. Pearson Education.
- Swokowski, E., & Cole, J. (2010). Algebra and Trigonometry. Nelson Education.
- Strang, G. (2016). Introduction to Linear Algebra. Wellesley-Cambridge Press.
- Larson, R., Hostetler, R., & Edwards, B. (2016). Precalculus with Limits. Cengage Learning.
- Lay, D. C. (2012). Linear Algebra and Its Applications. Pearson.
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