Rena used the steps below to evaluate the expression , when . Step 1: Substitute into the expression. Step 2: Simplify the parentheses. Step 3: Evaluate the power to a power. Step 4: Use reciprocals and find the value. In which step did Rena make the first error?

Step 4: Use reciprocals and find the value

Step-by-step explanation:

I think your question is missed of key information, allow me to add in and hope it will fit the original one.  

Please have a look at the attached photo.  

My

The right step 4 would be:

but she did it in the wrong way, she she left the terms and in the denominator while in step 3 they were also in the denominator hence in step 4 hat they should be in the numerator when raising to 1

Hope it will find you well.

step 4 is the answer

Step-by-step explanation:

answer: she must produce at least 9,000 windows in order to make a profit of $48,000

explanation:

48,000 - 12,000 = 36,000

36,000/4 = 9,000