I think it’s the last one
17.91*21=376.11
i used one side of the triangle because both sides are equal
Answer:
Step 2
Step-by-step explanation:
Michelle's step in trying to solve the equation is given below:

Michelle made a mistake in Step 2.
The right hand side of Step 1: 
Rather, the correct sum is:

Answer:
Step-by-step explanation: