Question

Nisha did the work below to solve an equation.Step 1Step 2Step 3Step 4.7b+3.2b-5-18.9210.2b-5-18.925.2b- 18.92D=3.64In which step did Nisha make her first error?O Step 1O Step 2OStep 3Step 4

Answer 1

We are going to solve the equation step by step and you can compare and find the step where nisha make her first error..

`\begin{gathered} \text{step 1} \\ 7b+3.2b-5-18.92=0 \\ \text{step 2: we }group\text{ the similars in parentheses and operate} \\ (7b+3.2b)+(-5-18.92)=0 \\ \text{step 3: } \\ (10.2b)+(-23.92)=0 \\ \text{step }4\colon\text{ we solve to b} \\ 10.2b=23.92 \\ b=(23.92)/(10.2)=2.34 \\ b=2.34 \end{gathered}`

Finally, comparing two solution process we conclude that the step where Nisha made her first mistake was 3rd step.