During a construction project, engineers used explosives to excavate 140 feet of tunnel into a mountain. but because of time constraints and environmental concerns, they brought in a tunnel boring machine (tbm) to excavate the rest of the tunnel. the data table lists some observations an engineer made about the length of the tunnel after the tbm was introduced. which equation represents the length of the completed tunnel based on the number of days since tbm was introduced? y = 45x 140 y = 405x 140 y = 68.33x 140 y = 25x 140
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