Answer:
1.8?
Step-by-step explanation:
2(10) +5(5)= 45
b=10 a=5
Plug in the values b and a.
Answer:
30
Step-by-step explanation:
Answer:
Step 5
Step-by-step explanation:
The mistake is in step 5.
The previous step was

The order operations, PEDMAS, must be applied:
We have Addition and Division here,
Using PEDMAS, we must divide first to get:

We can now add to get:

Therefore the mistake occurred at step 5