To reflect a function across the x axis, we want to turn all the x values that were once positive negative and vice versa. That means we want f(-x), which is:
What is this 12 x ? = 5
2 answers:
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Answer:
Light is moving at the speed = 77.78 km/min
Step-by-step explanation:
Given:
Distance between island and point P = 5 km
Moving along the the shoreline when it is 1 km from P.
So, x = 1
From the above statement light makes seven revolutions per minute.
Therefore,
Solution:
From the given figure.
Substitute x = 1
-------------------(1)
Now, first we differentiate both side with respect to t.
Using chain rule.
Substitute from equation 1.
Substitute
Applying cross multiplication rule.
Therefore, light is moving along the shore at the speed of 77.78 km/min
