Chapter 8: Q20. (page 410)
Graph the equation. Tell whether the equation is a function.
Short Answer
The equation is a function.
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Chapter 8: Q20. (page 410)
Graph the equation. Tell whether the equation is a function.
The equation is a function.
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The formula converts an area xin square miles to an approximate area y in square kilometers. The state of Iowa has an area of 56,276 square miles. Find this area in square kilometers. Round your answer to the nearest thousand square kilometers.
Graph the equation. Tell whether the equation is a function.
Evaluate the expression when and .
Write an inequality represented by the graph.

A skydiver uses an altimeter to track altitude so that he or she knows when to open the parachute. The altimeter determines altitude by measuring changes in atmospheric pressure. The graph below shows how pressure varies with altitude as a skydiver falls from 12,000 feet to ground level. (The elevation of the ground is assumed to be 0 feet with respect to sea level.)

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