Answer:
The airplane gains speed when it takes off. Then it begins to lose speed at the same rate. The plane then stays at the same speed the rest of the time.
Answer:
Option C is correct.
Step-by-step explanation:
Let the length be L
Let the width be W
The length of a rectangular floor is twice its width.
So, we get 
The length of the carpet is L
Carpet width is 2 feet less than the room, so 
Area of the carpet = 160 sq feet
We get :
As L=2W, we get
=> 
Equating to zero, we have
Taking out 2 common
=> 
=> 
We get roots as : (W-10) and (W+8)
Hence, W = 10 and W = -8(neglect this negative value)
Now, the width = 10 feet
Length = 
feet
Hence, option C is the answer.
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
The answers would be A,B,D, and F!
Answer:
the third one/second one
Step-by-step explanation:
