Question

Required information
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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 raised 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.
Month
January
February
March
April
May
June
July
August
September
October
Ingots
132
112
102
122
152
142
92
82
72
62
Power Cost
$6,380
$5,380
$5,280
$5,880
$6,880
$6,480
$4,880
$4,080
＄4,280
$3,280
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 162 ingots are processed.
Total power costs