Concept explainers
(a)
To write: two inequalities comparing the percent of increase from 1970 to 1980 to the percent of increase from 1980 to 1990.
(a)
Answer to Problem 34PPS
The price of milk in 1970 < the price of milk in 1980 and the price of milk in 1980 < the price of milk in 1990.
Explanation of Solution
Given information:
You will examine percent of change over time. The table gives the price of milk for various years.
Calculation:
The percent increase from 1970 to 1980:
The percent increase from 1980 to 1990:
So, the price of milk in 1970 < the price of milk in 1980 and the price of milk in 1980 < the price of milk in 1990.
(b)
To graph: the prices of milk over the years.
(b)
Explanation of Solution
Given information:
Use the
Calculation:
The graph of the price of milk over years:
(c)
To find: the decade had the greatest percent of increases in the price of milk.
(c)
Answer to Problem 34PPS
The decade is 1980-1990.
Explanation of Solution
Consider the graph from part (b),
From the above graph you can see that 1980-1990 had the greatest percent of increases in the price of milk.
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