Lesson 13: Practice Problems

Problem 1

The elevation of a submarine is shown in the table. Draw and label coordinate axes with an appropriate scale and plot the points.

time after noon (hours)	elevation (meters)
$0$	$- 567$
$1$	$- 892$
$2$	$- 1, 606$
$3$	$- 1, 289$
$4$	$- 990$
$5$	$- 702$
$6$	$- 365$

Problem 2 From Unit 7 Lesson 8

The inequalities $h > 42$ and $h < 60$ represent the height requirements for an amusement park ride, where $h$ represents a person’s height in inches.

Write a sentence or draw a sign that describes these rules as clearly as possible.

Problem 3

The $x$ -axis represents the number of hours before or after noon, and the $y$ -axis represents the temperature in degrees Celsius.

An xy-coordinate plane with the origin labeled "O". The region to the right of the y-axis and above the x-axis is labeled "Quadrant I." The region to the left of the y-axis and above the x-axis is labeled "Quadrant II." The region to the left of the y-axis and below the x-axis is labeled "Quadrant III." The region to the right of the y-axis and below the x-axis is labeled "Quadrant IV."

At 9 a.m., it was below freezing. In what quadrant would this point be plotted?
At 11 a.m., it was $10^{\circ} C$ . In what quadrant would this point be plotted?
Choose another time and temperature. Then tell the quadrant where the point should be plotted.
What does the point $(0, 0)$ represent in this context?

Problem 4 From Unit 6 Lesson 4

Solve each equation.

$3 a = 12$
$b + 3.3 = 8.9$
$1 = \frac{1}{4} c$
$5 \frac{1}{2} = d + \frac{1}{4}$
$2 e = 6.4$