The temperature of water in a certain lake on a day in October can be determined by using the model y=15.2-0.537x where x is the number of feet down from the surface of the lake and y is the Celsius temperature of the water at that depth. Based on this model, how deep in the lake is the water 9 degrees? (Round to the nearest foot.) a. 12 c. 67 b. 45 d. 30

Question

Taryn Lambert

Mathematics

18 August, 02:18

The temperature of water in a certain lake on a day in October can be determined by using the model y=15.2-0.537x where x is the number of feet down from the surface of the lake and y is the Celsius temperature of the water at that depth. Based on this model, how deep in the lake is the water 9 degrees? (Round to the nearest foot.) a. 12 c. 67 b. 45 d. 30

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Bronson Glenn · Answer 1

y=15.2-0.537x substitute 9 for y

9 = 15.2-0.537x add. 537x to both sides and subtract 9 from both sides

.537x = 6.2 divide both side by. 537

x = 11.545 round it to 12

Delilah Sweeney · Answer 2

The water is 9 degrees at a depth of 12 feet