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rosijanka [135]
3 years ago
8

A boat traveled 54 km with the stream and 42 km against the stream spending a total of as much time as it would spend while trav

elling 96 km in a lake. Find the speed of boat while it is travelling in the lake, if the current of the river is 3 km/hour.
Mathematics
1 answer:
SCORPION-xisa [38]3 years ago
4 0

Answer:

18 miles / hour

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3 years ago
Sally launches a rocket off of a platform. The height of the rocket, in meters, can be modeled by the function, h(x) = -5(x - 3)
Lorico [155]

Answer:

Time = 3secs

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Step-by-step explanation:

Given the height reached by the rocket modeled by the equation;

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The rocket velocity at its maximum height is zero.

Hence dh/dx = 0

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dh/dx = -10(x-3)

Since dh/dx = 0

0 = -10(x-3)

0 = -10x + 30

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<em>Hence it takes 3 secs to reach the maximum height.</em>

Get the maximum height reached by the rocket. Substitute x = 3 into the equation given;

Recall that:

h(x) = -5(x - 3)² + 56

If x  = 3

h(3) = -5(3 - 3)² + 56

h(3) = 0 + 56

h(3) = 56

<em>Hence the maximum height that the rocket reaches is 56m</em>

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3 years ago
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Answer:

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Step-by-step explanation:

hope this help

8 0
3 years ago
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