Answer:
B
Step-by-step explanation:
Do you have to show any work?
To get x to be by itself you would have to mutiply both sides by two so then it would look like this x=34. So the answer to your question is x=34
1060. trust me i’ve done that
Answer:
They sold 120 milkshakes that day
Step-by-step explanation:
We can set up a proportion
Note: If you have some value, 
, and it is 
of the total amount, you can find the value by doing the equation 
Answer:
400 m^2.
Step-by-step explanation:
The largest area is obtained where the enclosure is a square.
I think that's the right answer because a square is a special form of a rectangle.
So the square would be 20 * 20 = 400 m^2.
Proof:
Let the sides of the rectangle be x and y m long
The area A = xy.
Also the perimeter 2x + 2y = 80
x + y = 40
y = 40 - x.
So substituting for y in A = xy:-
A = x(40 - x)
A = 40x - x^2
For maximum value of A we find the derivative and equate it to 0:
derivative A' = 40 - 2x = 0
2x = 40
x = 20.
So y = 40 - x
= 40 - 20
=20
x and y are the same value so x = y.
Therefore for maximum area the rectangle is a square.
