Question 1124104: A marketing firm found that the equation S = 2.1A + 224 describes how the amount of sales S of a product depends on A, the amount spent on advertising the product. Both S and A are measured in thousands of dollars. For what amount, A, is the sales of a product at least 350 thousand dollars?
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! the formula is S = 2.1 * A + 224
when S = 350, the formula becomes 350 = 2.1 * A + 224
subtract 224 from both sides of this equation and then divide both sides of this equation by 2.1 to get:
(350 - 224) / 2.1 = A
solve for A to get A = 60.
so, if 60 thousand is spent on advertising, then the amount of sales can be expected to be 350,000.
your formula becomes S = 2.1 * 60 + 224 = 350.
all dollar figures are in thousands of dollars, including, presumably, the 224.
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