The volume of the balloon is 
Explanation:
The radius of the balloon is increasing at a rate of 3 cm/min.
To determine the volume of the balloon when the radius is 14 cm, we shall use the formula 
The rate of change of r with respect to time t is given by,

Now, we shall determine the

Now, we shall determine the
at
and substituting
, we get,

Thus, The volume of the balloon is 
Answer:
Minimum 7 buckets of water is needed to completely fill spherical storage tank.
Step-by-step explanation:
We are given the following in the question:
Cylindrical bucket:
Radius, r = 6 inches
Height = 18 inches
Volume of bucket = Volume of cylinder

Spherical storage tank:
Radius, r = 15 inches
Volume of tank = Volume of sphere =

Number of baskets required =

Thus, minimum 7 buckets of water is needed to completely fill spherical storage tank.
I think the answer is 47.6 also
Total = 3^x, where x is the number of jobs worked.
Let x = 7th job:
Total = 3^7 = 2187 pennies. = $21.87