18) Value of b is :
Option A is correct.
19) Option C is correct.
Step-by-step explanation:
18) We need to find the value of b.
The given equation is:
Solving to find the value of b:
So value of b is :
Option A is correct.
19) We need to find the correct graph of the equation:
Solving:
The values of y will be less than three. As y < 3 so, the circle on y is not filled.
So. Option C is correct.
Keywords: Solving Inequalities
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Answer:
The rate of change of the height is 0.021 meters per minute
Step-by-step explanation:
From the formula
Differentiate the equation with respect to time t, such that
To differentiate the product,
Let r² = u, so that
Then, using product rule
Since
Then,
Using the Chain's rule
∴
Then,
Now,
From the question
At the instant when
and
We will determine the value of h, using
Now, Putting the parameters into the equation
Hence, the rate of change of the height is 0.021 meters per minute.