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Chapter 1: Q45. (page 38)
Define a variable and write an inequality for each problem and then solve.
45. Twice the sum of a number and 5 is no more than 3 times that same number increased by 11.
The inequality is:
Value of the number is
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FIREWORKS
Suppose you are about a mile from a firework display. You count 5 seconds between seeing the light and hearing the sound of the firework display. You estimate the viewing angle is about . Using the information at the left, estimate the width of the firework display.
Information at the left
To estimate the width in feet of a firework burst, use the formula . In this formula, is the estimated viewing angle of the firework display and is the time in seconds from the instant you see the light until you hear the sound.
Answer the question that was posed at the beginning of the lesson.
How are formulas used by nurses?
Include the following in your answer:
Find the value of each expression
8.
Find the value of each expression
In 1950, the average price of a car was about . This may sound inexpensive, but the average income in 1950 was much less than it is now. To compare dollar amounts over time, use the formula , where A is the old dollar amount, S is the starting year鈥檚 Consumer price index (CPI), C is the converting year鈥檚 CPI, and V is the current value of the old dollar amount. Buying a car for in 1950 was like buying a car for how much money in 2000?
Year | Average CPI |
1950 | 42.1 |
1960 | 29.6 |
1970 | 38.8 |
1980 | 82.4 |
1990 | 130.7 |
2000 | 174.0 |
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