You have to make a proportion:
12+x/8=8/x
Then cross multiply to solve for x
TO solve this question on "how large of a sample must Beth have to get a margin of error less than 0.04", we will use the margin of error formula:
Here, for a 80% confidence level,
(given)
Thus, margin of error, E=0.04
rearranging we get:
Plugging in gives us:
Thus, Beth's sample for the true proportion of high school students in the area who attend their home basketball games must have 256 students.
Range of y = -3 cosx -1 is -4 < y < 2
Answer:
Answer is 5
Step-by-step explanation:
3-x+2=1/27
or, 5-x =1/27
or, 135-27x=1
or, x=135/27
or, x = 5