Answer:
The diameter decreases at a rate of 0.053 cm/min.
Step-by-step explanation:
Surface area of an snowball
The surface area of an snowball has the following equation:

In which d is the diameter.
Implicit differentiation:
To solve this question, we differentiate the equation for the surface area implictly, in function of t. So

Surface area decreases at a rate of 3 cm2/min
This means that 
Tind the rate (in cm/min) at which the diameter decreases when the diameter is 9 cm.
This is
when
. So




The diameter decreases at a rate of 0.053 cm/min.
F(6)= -10 because -2(6) is -12. -12+2 = -10
g(4)= 44 because pemdas mean we do exponents first so -4(-4)= 16. 16x2= 32. -4(-3)=12. 32+12=44
The answer is 5/6 or 0.8333...
8z = 64
divide both sides with 8
8z ÷8 = 64÷8
therefore,
z = 8.