The blades of a fan rotate clockwise at −225 rad/s at medium speed, and −355 rad/s at high speed. If it takes 3.05 seconds to get from medium to high speed, what is the average angular acceleration of the fan blades during this time?

-(355-225)/3.05

Please work it out and tell me if I did this correctly

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Hi Ion1776!

(try using the X2 tag just above the Reply box )
 Quote by Ion1776 The blades of a fan rotate clockwise at −225 rad/s at medium speed, and −355 rad/s at high speed. If it takes 3.05 seconds to get from medium to high speed, what is the average angular acceleration of the fan blades during this time? Is the answer -(355-225)/3.05 = 42.6 rad/s^2 Please work it out and tell me if I did this correctly
Yup, that's fine!

(apart from the sign)

the usual constant acceleration equations apply to angular distance speed and acceleration just as they do to linear distance speed and acceleration …

in this case, you can (and did) use v - u = at.