5(x-5)^4(x+4)
you raise x-5 to the 4th power because 5 has a multiplicity of 4
Given :
p = 0.68
margin of error, E = 0.1
99% confident interval
alpha, α = 1 - 0.99
= 0.01

∴
(z-critical value)
Sample size = 


= 144.37
= 145 (rounded off)
Therefore, there are 145 businesses does she need to sample to meet this criteria.
Answer:
11,15,19,23,27,31,35,39,43,47,51,....
4/5
Find common fractions of 12/15
12 / 15. each part divided by 3
15 / 3 = 5...12 / 3 = 4...12/15 = 4/5
Answer is 7
Work
4C-8= 20
+8
4C=28
28/4=7