Solve the Problem $$14 \mathrm { in } .$$ A Use a Coordinate System with the Origin at the Mirror

question 96

Multiple Choice

Solve the problem.
-Suppose a solar cooker has a parabolic mirror (see figure) .
$$14 \mathrm { in } .$$ a. Use a coordinate system with the origin at the vertex of the mirror and write an equation of a parabolic cross section of the mirror.
b. Where should a pot be placed so it receives maximum heat?

• A) a. \(x ^ { 2 } = 14 y\) for \(- 14 \leq x \leq 14\) b. The pot should be placed \(3.5 \mathrm { in }\). above the vertex
• B) a. \(x ^ { 2 } = 28 y\) for \(- 14 \leq x \leq 14\) b. The pot should be placed 28 in. above the vertex
• C) a. \(x ^ { 2 } = 14 y\) for \(- 14 \leq x \leq 14\) b. The pot should be placed \(14 \mathrm { in }\). above the vertex
• D) a. \(x ^ { 2 } = 28 y\) for \(- 14 \leq x \leq 14\) b. The pot should be placed 7 in. above the vertex

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Illustrates

To explain or make something clear by using examples, charts, pictures, etc., often to facilitate understanding.

Percentile

A value below which a certain percent of observations fall, used in ranking data within a data set.

Very High

A term used to describe a value or level that significantly exceeds established norms or averages.

Very Low

Describes a quantitatively small, minimal, or significantly below average level or amount.