Question

A student solved z + (-0.72) = -2.5 for z using the

Answer 1

Answer:

To solve, you must use the inverse operation. In step 1, -0.72 should have been subtracted from both sides, not added. Otherwise, 0.72 should have been added to both sides, not -0.72.

Step-by-step explanation:

Answer 2

Answer:

• Mistake in step1

Step-by-step explanation:

Given

• z + (-0.72) = -2.5

Solving in steps

• 1. ⇒ z + (-0.72) - (-0.72) = -2.5 - (-0.72)
• 2. ⇒ z = - (2.5 - 0.72)
• 3. ⇒ z = - 1.78

The student's mistake was adding (-0.72) instead of - (-0.72) or 0.72