Which sums are equal to -9+21? Choose all the correct answers.
A 21 +(-9)
B 9+(-21)
C (-9) + 9 + 12
D -(9 + 21)
E (-9) + (-21)

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.)