Solving Quadratic Equations By Using The Quadratic Formula Worksheet With Answers Page 39
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4170.
SOLUTION:
9-5 Solving Quadratic Equations by Using the Quadratic Formula
The graph shows no correlation between the year and the number of hurricanes because the points are randomly
spread out.
71. ENTERTAINMENT Coach Washington wants to take her softball team out for pizza and soft drinks after the last
game of the season. A large pizza costs $12, and a pitcher of a soft drink costs $3. She does not want to spend more
than $60. Write an inequality that represents this situation, and graph the solution set.
SOLUTION:
Let x = the number of pizzas she can buy and y = the number of pitchers of soft drink she can buy.
The graph crosses the y-axis at (0, 20) and has a slope of –4. Use a solid line because the inequality is ≤.
Test the point (0, 0) to see which side of the graph to shade.
Since 0 is less than or equal to 60, shade the half-plane that contains (0, 0).
Determine whether each sequence is arithmetic, geometric, or neither. Explain.
72. 20, 25, 30, ...
SOLUTION:
Check the difference and ratio between terms.
– 20 = 5
25
30 – 25 = 5
There is a common difference of 5 between the terms. The sequence is arithmetic.
73. 1000, 950, 900, ...
SOLUTION:
Check the difference and ratio between terms.
950
–
= –50
1000
900 – 950 = –50
There is a common difference of –50 between the terms. The sequence is arithmetic.
74. 200, 350, 650, …
SOLUTION:
Check the difference and ratio between terms.
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Page 39
– 200 = 150
350
650 – 350 = 200
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