need help with step by step through questions 6-10 explanation to get a deeper understanding

Use the following information to answer questions 6 through 10. Tax Masters, Inc, reported the following information about the cost of its tax preparation business for the first half of the year. 6. Use the high-low method to estimate the variable cost per tax return. b. $48.28 per return c. $65.00 per return d. $4000 per return 7. Use the high-low method to estimate the fixed cost component of tax preparation cost. 8. Use the high-low method to estimate tax preparation cost for a quarter in which 35,000 tax returns are expected. 9. Tax Master's new tax intern used Excel's regression function and the monthly data shown above to produce the following estimates. Assume that Tax Masters charges $100 per return to prepare a return. Use the regression results above to compute the number of tax returns that Tax Masters must prepare in a month to break even. 10. Tax Master's new intern has been running some data and presents the following regression results below, using Number of Hours Worked as the activity driver. She believes this model is better for predicting Total Preparation Costs in the future than the model used in the prior question. Do you agree or disagree, and why? a. Agree-lower variable cost per unit b. Disagree - higher total fixed cost c. Agree-lower R-squared value d. Disagree - lower R-squared value