Evaluating Expressions with Exponents Answers

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?

Which is the value of this expression when and ?

Nadine and Calvin are simplifying the expression .Nadine claims the first step to simplify the expression is to raise the numerator and denominator to the power of 4 to get .Calvin claims the first step to simplify the expression is to apply the quotient of powers to get .Who is correct and why?

Loi used these steps to simplify the expression .Step 1:Subtract the exponents of powers with like bases.Step 2:Apply the power of a product rule.Step 3:Write negative exponents as reciprocals using positive exponents.Step 4:Evaluate the power with the integer base.In which step did Loi make the first error?