Question 394541
The working formula is {{{F = P(1+r/n)^(nt)}}}, where
F = future value, or accumulated value
r = annual rate of interest,
n = number of times interest is compounded in a year, and 
t = number of years.

I will not work out the problems for you, I'll just tell you the value of n for each case. I leave them up to you to evaluate each accumulated value.
a. n = 2
b. n = 4
c. n = 12
d.  Use the formula for the continuous case, {{{F = Pe^(rt)}}}