Answer:
john is cutting wood planks. He has a 3 foot plank. he needs to cut them in 3/8 length pieces. How many pieces will he have?
1 answer:
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Answer:
Part A)
2nd and 5th choice.
Part B)
Step-by-step explanation:
For the given parabola, our focus is (-3, 2), and our directrix is given by y = 4.
Part A)
We are given a point (x, y) on the parabola.
Since our directrix is an equation of <em>y</em>, the distance from (x, y) to the directrix will simply be the absolute value of the difference in y-values. So:
Recall the distance formula:
Our distance from (x, y) to the focus (-3, 2) can be determined using the distance formula. Let (x, y) be (x₂, y₂) and let our focus (-3, 2) be (x₁, y₁). Therefore:
Hence, for Part A, our answers are the 2nd and 5th choices.
Part B)
Recall that by the definition of a parabola, any point (x, y) on it is equidistant to the directrix and focus. Hence:
Solve for <em>y</em>. Square both sides. We may remove the absolute value since anything squared is positive:
Square:
Rearrange:
Combine like terms:
Divide both sides by -4. Hence, our equation is: