What is 15 divided by 1/5?

answer this asap this is urgent and really easy but i am dumb and dont know the answer so me on this immediately this is very

Which of the following is the true for f(x) = 5cos

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 0.45, a standard deviation of 0.001, and margin of error of 0.5% a)0.44 b)0.46 c)0.45