Which simplifications of the powers of i are correct?

there may be more than one correct answer. select all correct answers.

a. i^27=−i

b. i^28=i

c. i^14=1

d. i^8=1

e. i^5=i

If 20% of a number is 35, what is 50% of that number?

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 25, a standard deviation of 2.5, and margin of error of 5%