3. (a) Change 0 = tan to an equivalent rectangular equation. (b) By changing to rectangular coordinates show that r= 4 sec2 (0/2) is a parabola. Find the focus and equation of the directrix of the parabola.
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.
![### Educational Exercise Problems
1. **Find the equation of the ellipse:**
- Eccentricity: \(\frac{3}{5}\)
- Endpoints of the minor axis: \((-3, -5)\) and \((-3, 3)\)
2. **Solve the following:**
- (a) Solve: \(x + \ln x \leq \ln x + 1\)
- (b) Solve algebraically for \(x\) (exact answers only):
\[
\frac{e^x - e^{-x}}{2} = 2
\]
3. **Convert and analyze equations:**
- (a) Change \(\theta = \tan^{-1} \frac{3}{2}\) to an equivalent rectangular equation.
- (b) By changing to rectangular coordinates, show that \(r = 4 \sec^2 (\theta/2)\) is a parabola. Find the focus and equation of the directrix of the parabola.
4. **Dissolution of a solid:**
- If a solid is placed in water, the amount undissolved after \(t\) seconds is \(A(t) = A_0 e^{-kt}\). If 30 grams of the solid are placed in the water and it takes 10 seconds for half to dissolve, how long will it take for 3 grams to be left undissolved?
5. **Find the equation of the parabola:**
- A parabola has a horizontal axis of symmetry, passing through the points \((0, 3)\), \((-2, 1)\), and \((6, -3)\).
6. **Repeat for emphasis**:
- If a solid is placed in water, the amount undissolved after \(t\) seconds is \(A(t) = A_0 e^{-kt}\). If 30 grams of the solid are placed in the water and it takes 10 seconds for half to dissolve, how long will it take for 3 grams to be left undissolved?
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**Note**: Problems may contain complex concepts requiring a strong understanding of calculus and algebra. Each task involves analyzing specific conditions, converting between different forms of equations, or solving for unknown variables.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1f399190-75cd-4c8c-8fe8-2a7dabc2f223%2F3ef17cd7-324a-4491-bd2e-f898054a0ad6%2F4eisof.jpeg&w=3840&q=75)
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(a) Given equation is
We know that the relation between rectangular and polar coordinates is
Therefore, is equivalent to
Step by step
Solved in 2 steps
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