Answer:

Step-by-step explanation:
The solution is in the attached file
The answer is 1 km
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Proofs:
Area of a rectangle=length x width
Area of rectangle= 4kmE2
Length of rectangle= 4km
Width of rectangle= X
4=4(x)
Find x
4=4(1)
Therefore the width of the rectangle= 1km
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Brainliest?
Make an equation for this find the variables P and t and 200. Them plug the into an equation like y=mx+b.
Answer:
x= -4
Step-by-step explanation:
Simplifying
5x + -4 = 7x + 4
Solving
-4 + 5x = 4 + 7x
Move all terms containing x to the left, all other terms to the right.
Add '-7x' to each side of the equation.
-4 + 5x + -7x = 4 + 7x + -7x
Combine like terms: 5x + -7x = -2x
-4 + -2x = 4 + 7x + -7x
Combine like terms: 7x + -7x = 0
-4 + -2x = 4 + 0
-4 + -2x = 4
Add '4' to each side of the equation.
-4 + 4 + -2x = 4 + 4
Combine like terms: -4 + 4 = 0
0 + -2x = 4 + 4
-2x = 4 + 4
Combine like terms: 4 + 4 = 8
-2x = 8
Divide each side by '-2'.
x = -4
Simplifying
x = -4