Please show all calculations (how you derived all values) and explain all steps. Thank you

PROBLEM 8-5 Disaggregating and Analyzing Return on Common Equity CHECK (a) Yr. 5 RNOA \=10.0 Selected financial statement data from Texas Telecom, Inc., for Years 5 and 9 are reproduced below ( \\( \\$ \\) millions): Required: a. Calculate return on common equity and disaggregate ROCE for Years 5 and 9 using end-of-year values for computations requiring an average (assume fixed assets and working capital are operating and a 50\\% tax rate). b. Comment on Texas Telecom's use of financial leverage