Managerial accounting questions - cost behavious and CVP question

Travis Metals heats copper ingots to a high temperature by placing them in a large oven. The heated ingots are then run through a shaping machine that forms them into wire. Due to the length of time it takes the oven to heat up, it is never turned off. When the ingots are placed in the oven the temperature is ralsed to a higher level, Once they are done being heated the oven temperature is turned back down until a new batch of ingots is ready to be heated. The following information shows the ingots processed and the power costs over the past 10 months. Required: 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 142 ingots are processed