Answer: 1068
Step-by-step explanation:
Formula of sample size :
, where p = prior population proportion , E = margin of error , = Critical z- value.
Let p = proportion of visitors who are repeat visitors.
Given : p=0.5
E= 3%= 0.03
critical z-value for 95% confidence = 1.96
Now,
[round to the next integer]
Hence, the required sample size = 1068
Answer:
A full size school bus is any bus over 35 feet in length, with most between 40 – 42 feet in length
Step-by-step explanation:
First expression: (2+f)15
Second expression: 2×15+f×15
Answer: $30+15f
Would that look like ? If so, you can multiply both sides by (4x-9) to cancel the 4x-9 on the bottom and get it onto the other side. It would look like this: .
Distribute the 27 to the 4x and -9, which will get you this:.
Then you want to add the 243 on both sides to isolate the x which should get you this: .
Your next to final step is to divide both sides by 108 to leave the x alone. This will appear like this: .
Your last step is to simplify the fraction or convert it into a decimal depending on which you prefer. If simplified, you should get and for a decimal you will get
It's an upside (-) down parabola. The axis of symmetry is the x coordinate of the vertex.
you can easily find this using formula: x= -b/2a
for parabola: ax² + b + c = 0
x = -16 ÷ 2(-4)
x = 2
Answer C