Would you be able to help me with x variables
1 answer:
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Answer:
0.0221 cm/min
Step-by-step explanation:
Surface area of a snowball:
An snowball has a spherical format.
The surface area of an sphere is given by:
In which r is the radius(half the diameter). So in function of the diameter, we have that:
Implicit derivative:
To solve this question, we need to find the implicit derivative of A in function of t.
The variables are A and d, so:
Its surface area decreases at a rate of 5 cm2/min
This means that
Find the rate (in cm/min) at which the diameter decreases when the diameter is 9 cm
This is when
. So
This means that the diameter decreases at a rate of 0.0221 cm/min when the diameter is 9 cm.
Answer:
x = ± 6
Step-by-step explanation:
Given
x² - 72 = 0 ( add 72 to both sides )
x² = 72 ( take the square root of both sides )
x = ± = ±
= ± 6