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Otrada [13]
2 years ago
14

Help please i need help

Mathematics
1 answer:
astra-53 [7]2 years ago
6 0

Answer:

196

Step-by-step explanation:

7 * 14 = 98

7 * 14 = 98

98 + 98 = 196

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Answer:

The rate at which the distance between them is changing at 2:00 p.m. is approximately 1.92 km/h

Step-by-step explanation:

At noon the location of Lan = 300 km north of Makenna

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The distance  Lan has traveled at 2:00 PM = 2 h × 60 km/h = 120 km

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By Pythagoras' theorem, we have;

s² = x² + y²

The distance between them at 2:00 p.m. s = √(180² + 150²) = 30·√61

ds²/dt = dx²/dt + dy²/dt

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2×30·√61 × ds/dt = 2×150×75 + 2×180×(-60) = 900

ds/dt = 900/(2×30·√61) ≈ 1.92

The rate at which the distance between them is changing at 2:00 p.m. ds/dt ≈ 1.92 km/h

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