The first one should be the third option and the second one should be the first one.
Answer:
4x+12/x^2+9
Step-by-step explanation:
Perimeter
x+3+x+3+x+3+x+3
Area
(x+3)(x+3)
Answer:
8 celcius
Step-by-step explanation:
The slope is -8 so it is decreasing by 8
Answer:
The fifth line contains the error.
Step-by-step explanation:
Line 1 is the equation.
Lines 2, 3, and 4 are correct.
The error is in the 5th line.
The square root of a negative number is not a real number, so if this problem is solved only with real numbers, there is no solution.
If imaginary numbers are allowed, then the last line should read:

Answer:
1.8940279x10^9+27
Step-by-step explanation:
