I'm stuck on numbers 3 and 4 only. Thanks

Estimating Cost Behavior Using Scattergraph, High-Low, and Least-Squares Regression Methods Sigrid's Custom Graphics specializes in creating and painting store window advertisement displays. The majority of its business comes from local retailers and fast-food restaurants. A portion of Sigrid's operating information for the past year follows: Required: 1. Prepare a scattergraph of Sigrid's operating cost and draw the line you believe best fits the data. 2. Based on this graph, estimate Sigrid's total fixed costs per month. 3. Using the high-low method, calculate Sigrid's total fixed operating costs and variable operating cost per window. 4. Using the high-low method results, calculate the expected operating cost for the business if it paints 96 windows