In 139.4 
sec rapidly is area of enclosed by the ripple increasing at the end of 6.4 seconds.
What is area of circle?
For measuring the area occupied by a circular field or plot, use the area of a circle formula. The area formula will allow us to determine how much fabric is required to completely cover a circular table, for example. We can determine the boundary length, or the circle's circumference, using the area formula.
Here area of circle
=> A= π
--------> 1
Differentiating 1 with respect to to time then
=> 
If the radius is increasing at a constant rate 3.3ft/sec then after 6.4 seconds, radius is
=> 6.4*3.3=21.12 ft.
We know 
and so ,
=> 
= 2**21.12*3.3=139.4 sec.
Hence In 139.4 sec rapidly is area of enclosed by the ripple increasing at the end of 6.4 seconds.
To learn more about area of circle refer the below link
brainly.com/question/10645610
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Answer:
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Step-by-step explanation:
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8*4 = 32
Now, we need to solve this:-
32 = (?*7) - (?*3)
32=8*7 - 8*3
32= 56 - 24
32 = 32
So our equation is:-
8*4 = (8*7) - (8*3)
Hey there,
6x + 5 (x-2)
6x + 5x - 10
11x - 10
3x - 5 - x + 9
3x - x - 5 + 9
2x + 4
3a + 5 - 8a + 1
3 (-1) + 5 - 8(-1) + 1
-3 + 5 + 8 + 1
11
Hope this helps :))
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Answer and work down below. Let me know if you have questions
