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Mrs. Boyler wrote an equation on the board. She asked the students to solve for the variable, [tex]d[/tex]. Akeem solved it on his paper using the following steps.

\begin{tabular}{|l|l|}
\hline Step 1 & [tex]\frac{d}{0.13}=5.2[/tex] \\
\hline Step 2 & [tex](0.13) \frac{d}{0.13}=\frac{5.2}{(0.13)}[/tex] \\
\hline Step 3 & [tex]d=40[/tex] \\
\hline
\end{tabular}

Part A: Review Akeem's work for solving the equation. State the step in which the error occurred, and describe the error using your mathematical vocabulary. (2 points)

Part B: Solve the equation, correcting any errors you may find. Show all the steps in your work. (4 points)


Sagot :

Certainly! Let's review Akeem's work and solve the equation correctly.

### Part A: Review Akeem's Work

Firstly, let's review Akeem's steps to find where the mistake happened.

1. Step 1:
[tex]\[ \frac{d}{0.13} = 5.2 \][/tex]
This step is correct and sets up the initial equation correctly.

2. Step 2:
[tex]\[ 0.13 \cdot \frac{d}{0.13} = \frac{5.2}{0.13} \][/tex]
Akeem tried to clear the fraction by multiplying both sides by [tex]\(0.13\)[/tex]. However, there’s an error in performing the operation correctly. The left side should simplify to [tex]\(d\)[/tex], but it seems he might have incorrectly applied the multiplication to the right side as well.

3. Step 3:
[tex]\[ d = 40 \][/tex]
This result appears after the incorrect Step 2 and is therefore incorrect.

Error Identification:
- The mistake occurred in Step 2. The correct procedure involves multiplying both sides of the equation by [tex]\(0.13\)[/tex] to clear the denominator, not taking reciprocal operations, which leads to incorrect simplification. The correct simplification should be:
[tex]\[ \frac{d}{0.13} \cdot 0.13 = 5.2 \cdot 0.13 \][/tex]

### Part B: Correct Solution

Now, let's solve the equation step-by-step correctly.

1. Original Equation:
[tex]\[ \frac{d}{0.13} = 5.2 \][/tex]

2. Multiply both sides by [tex]\(0.13\)[/tex] to isolate [tex]\(d\)[/tex]:
[tex]\[ \left( \frac{d}{0.13} \right) \cdot 0.13 = 5.2 \cdot 0.13 \][/tex]

3. Simplify the left side:
[tex]\[ d = 5.2 \cdot 0.13 \][/tex]

4. Perform the multiplication:
[tex]\[ d = 0.676 \][/tex]

Thus, the correct value of [tex]\(d\)[/tex] is [tex]\(\boxed{0.676}\)[/tex].