The following table shows the percentage P = P(d) of the American food dollar that was spent on eating away from home (at restaurants, for example) as a function of the date d. d = Year P = Percent spent away from home 1969 25% 1989 30% 2009 34% (a) Find P(1969). % Estimate P(1999). (Round your answer to the nearest integer.) % (c) What is the average rate of change per year in percentage of the food dollar spent away from home for the period from 1989 to 2009? % points per year Estimate P(2008). (Hint: Your calculation in part (c) should be useful.) % (e) Estimate the value of P(2012). % Explain how you made your estimate
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
The following table shows the percentage P = P(d) of the American food dollar that was spent on eating away from home (at restaurants, for example) as a function of the date d.
| d = Year | P = Percent spent away from home |
|---|---|
| 1969 | 25% |
| 1989 | 30% |
| 2009 | 34% |
%
%
(c) What is the average rate of change per year in percentage of the food dollar spent away from home for the period from 1989 to 2009?
% points per year
%
(e) Estimate the value of P(2012).
%
Explain how you made your estimate.
| P(2012) | = | 34 + × 0.2 |
| = | % |
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