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Sagot :
Answer:
- newspaper ads: $42.3 billion
- television ads: $36.9 billion
- radio ads: $8.3 billion
Step-by-step explanation:
You want the amount spent on ads in each medium given the total and relations between amounts spent for newspaper, television, and radio ads.
Setup
Let n, t, r represent the amounts spent on ads in newspapers, television, and radio, respectively. The given relations tell you ....
n +t +r = 87.5
-n +t +r = 2.9
n -t = 5.4
Solution
The augmented coefficient matrix can be reduced to row-echelon form using a suitable calculator or spreadsheet. This tells you the amounts spent in each medium. The attachment shows this.
- newspaper ads: $42.3 billion
- television ads: $36.9 billion
- radio ads: $8.3 billion
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Additional comment
The value of n can be found by subtracting the second equation from the first. That can be used in the third equation to find t, and both of those values can be used in either of the first two equations to find r.
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