Error analysis: a student solves the equation s=2lw+2lh+2wh for w and his answer are w=s-2lh-2lh\h describing and correct the student's

robert puts 2 in each row

isaiah walks 3 miles due north, turns and then 5 miles due east. how far is he from his starting point?

a^2 + b^2 = c^2

let c = distance from starting point.

(3)^2 + (5)^2 = c^2

9 + 25 = c^2

34 = c^2

sqrt{34} = sqrt{c^2}

sqrt{34} = c