Question

***WILL GIVE MEDAL***

A student is attempting to isolate the variable t in the literal equation below. Which statement best applies to the sample mathematical work shown?
Given: 2t + s – 4 = 8 – s
Step 1: I first add s + 4 to both sides, resulting in 2t + 2s = 12.
Step 2: I then subtract 2s from both sides, resulting in 2t = 8 – 2s.
Step 3: I then divide both sides by 2, giving a final answer of t = 4 – s.
A.

The student failed to add the proper quantity in Step 1.
B.

The student failed to subtract 2s from both sides properly in Step 2.
C.

The student failed to divide both sides by 2 properly in Step 3.
D.

The mathematical work is correct as written.

Answer 1

A. The student failed to add the proper quantity in Step 1.

He was supposed to add 4 and subtract s from both sides.