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1.mario,the manager of a pizza restaurant,determines that a pizza of d cm in diameter should be sold at $1/20(d^2+10d+500). a)how much should mario charge for a pizza of 38 cm in diatmeter?答:$116 b)what is the diameter of a pizza that costs $68?答:$24.7
最佳解答:
For a pizza with diameter 38 cm. That is d = 38 So, cost for a pizza = 1/20 (38^2 + 10 X 38 + 500) = $116.2 = $116 (cor. to 3 sig. fig.) b. 1/20 (d^2 + 10d + 500) = 68 d^2 + 10d + 500 = 1360 d^2 + 10d - 860 = 0 d = 24.7 (cor. to 3 sig. fig.) or -34.7 (rejected) So, the diameter of the pizza is 24.7 cm.
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