The radius of the sphere decreases at the rate of 6 m/ sec
That is,
Surface Area of the sphere of radius r is given by
Differentiating with respect to t,
X + x +8 = 32
2x + 8 = 32
2x = 24
x = 12
So gerardo has won 12 and jenny has won 20
The first one is 156, the second 420 the third is 6,138 and the forth one is 64.
13 + (-12) - (-5)
13 - 12 + 5
1 + 5
= 6.
Answer is A)