3-14 High-Low Method; Scattergraph Analysis [$ LO2] The following information shows the ingots processed and the power costs over the past 10 months. Month Power Cost Ingots January 110 $5,500 February 90 $4,500 Marcl 80 $4,400 April 100 $5.000 May 130 $6,000 June 120 $5.600 July 70 $4.000 August 60 S 3.200 September 50 $3,400 October 40 $2,400 Required: to the number of ingots processed in a month? Explain. 2. Using the high-low method, estimate a cost formula for power costs. Express the formula in the form Y=a+bX. 3. Predict total power costs in a month when 140 ingots are processed