Answer:
slope is negative 3
-3
Step-by-step explanation:
Option A
The inches of snow fall during the month of January when the average temperature is 2°F is 17.747 inches
<em><u>Solution:</u></em>
Given that the equation of the line of best fit is:
y = -0.368x + 18.483
Where "y" is the total snowfall in her city
"x" is the average temperature
To find: Inches of snow fall during the month of January when the average temperature is 
Substitute x = 2 in given equation to find the total snowfall
y = -0.368x + 18.483
y = -0.368(2) + 18.483
y = -0.736 + 18.483
y = 17.747
Therefore inches of snow fall during the month of January when the average temperature is 2°F is 17.747 inches
The area is:
A = x * y = 20000
The cost function is:
C = 2.50 (2x) +3.50 (2y)
Rewriting we have:
C = 5x + 7y
Writing as a function of x we have:
C = 5x + 7 (20000 / x)
Rewriting:
C (x) = 5x + 140000 / x
We derive:
C '(x) = 5-140000 / x ^ 2
We equal zero and clear x:
0 = 5-140000 / x ^ 2
140000 / x ^ 2 = 5
x ^ 2 = 140000/5
x = root (140000/5)
x = 167.33 feet
Therefore the cost is:
C (167.33) = 5 * (167.33) + 7 * (20000 / 167.33)
C (167.33) = 1673.32 $
Answer:
The cost of the least expensive fence is:
$ 1673.32
Answer:
A
Step-by-step explanation:
One way to see if two ratios are proportional is to write them as fractions and then reduce them. If the reduced fractions are the same, your ratios are proportional.