Respuesta :
Answer:
(a) amount spent on newspaper ads = $42.8 billion.
(b) amount spent on television ads = $37.2 billion.
(c) amount spent on radio ads = $8.4 billion.
Step-by-step explanation:
Let us denote amount spent on Newspaper ads by symbol N.
            amount spent on Television ads by symbol T.
            amount spent on Radio ads by symbol R.
- Given Total amount spent on newspaper, television, and radio ads =
          N + T + R = $88.4 billion  -------- [Equation 1]
- Total amount spent on television and radio ads was only $2.8 billion more than the amount spent on newspaper ads alone is represented by the expression :
          T + R = $2.8 + N  ---------- [Equation 2]
- The amount spent on newspaper ads was $5.6 billion more than what was spent on television ads.
            N = $5.6 + T ----------- [Equation 3]
Now, taking value of R from Equation 1 and Equation 2 respectively we get;
       R = $88.4 - T - N ------------ [Equation 4]
       R = $2.8 + N - T ------------- [Equation 5]
Equating and solving Equation 4 and 5 we get,
      $88.4 - T - N = $2.8 + N - T
      $88.4 - $2.8 = 2*N
  Hence, N = $42.8 billion.
Now putting value of N in Equation 3 we get T = $42.8 - $5.6 = $37.2 billion.
And at last putting values of N & T in Equation 1 we get,
        R = $88.4 - $37.2 - $42.8 = $8.4 billion .
Therefore, amount spent on newspaper ads = $42.8 billion.
         amount spent on television ads = $37.2 billion.
         amount spent on radio ads = $8.4 billion.
