Describe the error in finding the distance between $A(6,\ 2)$ and $B(1,-4)$ . Student work marked wrong shows the steps in a calculation. First line. A B equals left-parentheses 6 minus 1 right-parentheses squared plus left bracket 2 minus left-parentheses negative 4 right-parentheses right bracket to the second power. Second line. Equals 5 squared plus 6 squared. Third line. Equals 25 plus 36. Fourth line. Equals 61.

Did not use a ruler.

Did not find the midpoint.

Did not take the square root.

Did not make all the signs positive.
Question 2
The actual length, $AB$ , rounded to the nearest tenth is
units.