HELP I WILL GIVE BRANLIEST IF CORRECT The steps to solving the expression the quantity of the sum of seven squared plus three divided by the absolute value of negative 0.5 end quantity minus 18.6 ÷ 6 are listed below.

Part A: Explain what the missing expression should be in Step 4. (6 points)

Part B: Explain what the missing expression should be in Step 6. (6 points)