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How do you determine whether a relationship represented as as graph is linear or nonlinear

During a wright loss challenge your friend goes from 125 pounds to 100 pounds.what was the percent weight loss

Aci is desired for the true average stray-load loss μ (watts) for a certain type of induction motor when the line current is held at 10 amps for a speed of 1500 rpm. assume that stray-load loss is normally distributed with σ = 2.3. (round your answers to two decimal places.)