Answer:

Step-by-step explanation:
Given


Required
Determine the percentage population increase
This is calculated using the following formula:






<em>Hence, there is a 4% increment from 2014 to 2015</em>
the answer is the second graph (b) ^^
<span>The absolute value is 9.8, (example): if it was -3 (negative 3) then the absolute value would be just 3 (or positive 3). The absolute value is always positive.
Hope this helped! :)</span>
<span>The canyon starts at an elevation of (-14.5). After each year, the elevation drops by (-1.5). The equation that could be written for this, then, would be (-14.5 - 1.5x = -31). First, we could add 14.5 to both sides of the equation to isolate the unknown. This would leave -1.5x = -16.5. Next, we can remove the negative signs so both sides of the equation are positive and easier to work with. This leaves 1.5x = 16.5. Finally, dividing both sides by 1.5 gives us "x = 11", which means that after 11 years, the canyon floor will be at -31 feet.</span>
Answer:
94
Step-by-step explanation:
Margin of error = E = $ 120
Confidence Level = 95%
The z-score for 95% confidence level from the z-table = z = 1.96
Population standard deviation = σ = $593
Sample size = n = ?
The formula to calculate the margin of error is:

Re-arranging the equation, we get:

Using the given values in above equation, we get:

Rounding of to next higher integer, we get n = 94
Thus, we need a sample size of 94 to estimate an unknown population mean μ