Fourths, then b. Sorry if late.
Surface area of a ball:
S=4πr^2=4*π*5^2=100π
Volume of a circle:
V=4/3*π*r^3=4/3*π*125=(500/3)*π=165π
The approximate surface-area-to-volume ratio would be 1:1,5
The number of permutations of the 4 different digits is:

The answer is 24 ways.
Answer:
$138,345
Step-by-step explanation:
This is a compound decline problem, which will be solve by the compound formula:

Where
F is the future value (value of house at 2030, 14 years from 2016)
P is the present value ($245,000)
r is the rate of decline, in decimal (r = 4% = 4/100 = 0.04)
t is the time in years (2016 to 2030 is 14 years, so t = 14)
We substitute the known values and find F:

Rounding it up, it will be worth around $138,345 at 2030