-4 because it makes it true
Answer:
The answer is 
Step-by-step explanation:
Assuming the snowball is a perfect sphere, then if A denotes the surface area and D the diameter then:

Differentiating wrt r we have:

We are told that
and we want to find 
By the chain rule we have:

∴
∴
When D=10 then

The sign (-) shows that the D is decreasing.
Answer:
Part A:
Rent = $7380
Mortgage payments = $9800
Insurance = $145
Taxes, insurance, maintenance =
= $2830
Loss of Interest on security deposit = (650*6%) = $39
Interest lost on down payment and closing cost = (4,500*6%) = $270
Growth in equity = $225
Annual appreciation = $1700
Tax savings for mortgage interest = (9,575*28%) = $2,681
Tax savings for property taxes = (1,780*28%) = $498
Total rental cost =
dollars
Total buying costs =
dollars
Part B:
You should consider rent because the cost of renting is less than the cost of buying.
What you can put is an obtuse 108 degrees
<span />
They are the same just the fraction and decimal are not the same but your answer is the same or =