Question

dave tried to evaluate \\(55 - 15 + 20\\) step-by-step.

\\55 - 15 + 20\\
\\= 40 + 20\quad \text{step 1}\\
\\= 20\quad \text{step 2}\\

find daves mistake.

choose 1 answer:
(a) step 1
(b) step 2
(c) dave did not make a mistake

Explanation:

Analyze Step 1

Using the Order of Operations knowledge point

$$
LATEXBLOCK0
$$

Analyze Step 2

Using the Error Analysis knowledge point

$$
LATEXBLOCK1
$$

Answer:

• (A) Step 1
• (B) Step 2 (Correct answer)
• (C) Dave did not make a mistake