Question

Find the domain, period, range, and amplitude of the cosine function.

y = -6cos4x

Answer 1

domain is all real numbers
amplitude is the number in front of cosine, take the absolute value of it
it is 6
range is how high it goes and how low it goes

Answer 2

http://www.wolframalpha.com/input/?i=graph+y+%3D+-6cos4x
look at it graph
range is [-6, 6]

Answer 3

I found my answer. Thank you!

Answer 4

period is max point to max point

Answer 5

that should be your period