Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
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![### Solving Rational Inequalities and Graphing the Solution Set
#### Problem Statement:
Solve the following rational inequality and graph the solution set on a real number line:
\[ \frac{x + 1}{x + 5} < 2 \]
#### Solution Steps:
1. **Rewrite the Inequality**:
First, rewrite the inequality in a standard form by bringing all terms to one side.
\[ \frac{x + 1}{x + 5} - 2 < 0 \]
2. **Combine the Terms**:
Combine the terms into a single fraction.
\[ \frac{x + 1 - 2(x + 5)}{x + 5} < 0 \]
Simplify the numerator:
\[ \frac{x + 1 - 2x - 10}{x + 5} < 0 \]
\[ \frac{-x - 9}{x + 5} < 0 \]
3. **Determine Critical Points**:
Find the values that make the numerator and denominator zero.
- Numerator: \(-x - 9 = 0\) ⟹ \( x = -9 \)
- Denominator: \(x + 5 = 0\) ⟹ \( x = -5 \)
4. **Test Intervals**:
The critical points divide the number line into intervals. Test each interval to determine where the inequality holds true:
- Interval 1: \( (-\infty, -9) \)
- Interval 2: \( (-9, -5) \)
- Interval 3: \( (-5, \infty) \)
Select test points for each interval:
- For \( (-\infty, -9) \), test \( x = -10 \)
- For \( (-9, -5) \), test \( x = -7 \)
- For \( (-5, \infty) \), test \( x = 0 \)
Evaluate the inequality \( \frac{-x - 9}{x + 5} < 0 \) for each test point.
5. **Graph the Solution**:
Graph the solution set on a real number line, marking the intervals where the inequality is satisfied. Note that the critical points \( x=-9 \) and \( x=-5 \) will not](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbaa3e418-f7f0-46cd-8916-fbe0f2fd3c97%2F4a0a5550-9c13-4f45-a036-c7c1f8552e1d%2Fwr703bc.jpeg&w=3840&q=75)

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