A=s^2
A=6.3^2
(A=6.3x6.3)
And your answer would be:
A=39.69cm^2
S1: 7x - 4x - 2 = 6 OK
S2: 3x - 2 = 6 OK
S3: 3x - 2 + 2 = 6 WRONG, correct is 3x - 2 + 2 = 6 + 2
Answer: c. Step 3, because a number has been added only to one side of the equation.
X=3 y=5 hope this helped :)
