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Amar tried to evaluate an expression step by step.

{:[-2+5-(-3)],[=-2+5-3quad" Step "1],[=-2+2quad" Step 2 "],[{:[=0," Step "3]:}]:}
Find Amar's first mistake.
Choose 1 answer:
(A) Amar was supposed to add 3 , not subtract 3 .
(B) 5 minus 3 equals -2 , not 2.
(C) -2 plus 2 equals -4 , not 0.

Amar tried to evaluate an expression step by step. $\newline$ $\begin{array}{l} -2+5-(-3) \\ =-2+5-3 \quad \text { Step } 1 \\ =-2+2 \quad \text { Step 2 } \\ =0 \quad \text { Step } 3 \\ \end{array}$ $\newline$ Find Amar's first mistake. $\newline$ Choose $1$ answer: $\newline$ (A) Amar was supposed to add $3$ , not subtract $3$ . $\newline$ (B) $5$ minus $3$ equals $-2$ , not $2$ . $\newline$ (C) $-2$ plus $2$ equals $-4$ , not $0$ .

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Solve a system of equations using substitution: word problems

Full solution

Q. Amar tried to evaluate an expression step by step.

\newline

\begin{array}{l} -2+5-(-3) \\ =-2+5-3 \quad \text { Step } 1 \\ =-2+2 \quad \text { Step 2 } \\ =0 \quad \text { Step } 3 \\ \end{array}

\newline

Find Amar's first mistake.

\newline

Choose

1

answer:

\newline

(A) Amar was supposed to add

3

, not subtract

3

.

\newline

(B)

5

minus

3

equals

-2

, not

2

.

\newline

(C)

-2

plus

2

equals

-4

, not

0

.

Original Expression: Amar's original expression is: $-2 + 5 - (-3)$ $\newline$ In Step $1$ , Amar evaluates the expression as: $-2 + 5 - 3$ $\newline$ Let's check if this step is correct. The negative sign in front of the parentheses indicates that we should change the sign of the number inside when removing the parentheses. Therefore, $-(-3)$ becomes $+3$ . $\newline$ The correct evaluation should be: $-2 + 5 + 3$

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\newline

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Question

Jessie tried to solve an equation step by step.

\newline

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\newline

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Find Jessie's mistake.

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Question

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\newline

\begin{aligned} \frac{1}{2} w-12 & =18 \\ \frac{1}{2} w & =30 \quad \text { Step } 1 \\ w & =15 \quad \text { Step 2 } \end{aligned}

\newline

Find Leon's mistake.

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Question

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\newline

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\newline

Find Olga's mistake.

\newline

1

\newline

1

\newline

2

\newline

\operatorname{Step} 3

\newline

D Olga did not make a mistake.

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\newline

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\newline

1

\newline

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\newline

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\newline

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\newline

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Question

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\newline

1

\newline

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\newline

2

\newline

4

\newline

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