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Sal made at least one error as he found the value of this expression. 
 

3(-10+2[3/2(-10)]+4[1/4(20)]+5(20)

 

Sals steps:

 

step 1: 3(-10)+2(-15)+4(5)+5(20)

step 2: (3+2)(-10+-15)+(4+5)(5+20)

step 3: 5(-25)+9(25)

step 4: -125+225

step 5: 100

 

identify the step in which sal made his first error. After identifying the step with the first error, write the corrected steps and find the final answer

 Apr 29, 2021
 #1
avatar+524 
+2

First of all, I think there's a small error in the expression given, 

However minute it may seem it can confuse easily... So the correction is 

 

                      \(3(-10)+2[3/2(-10)]+4[1/4(20)]+5(20) \)

 

Now, after referring the steps we see that Sal made his first error in step 2. 

∴ The correction is here as follows - 

 

\(3(-10)+2[{3\over 2}.-10]+4[{1\over 4}.20]+5(20) = 3(-10)+2(-15)+4(5)+5(20) \)

                                                                       \(=-30-30+20+100\)

                                                                       \(=60\)

∴ The final answer is 60.

 Apr 30, 2021

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