- Having trouble , help Sin 60degrees + cos 30 degrees equals?

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Find the GCF of the following terms:
12xy, 36xy, 60? How many kilometers can you run in 22 minutes? 8/5-5/x divided by 5/6+4/x^2? Solve the equation 2cos(x+7pi/4)= square root of 3 ,which lie in [0,2pi) .find smallest and largest solution. Please show details ! Thanks? Domain: -1, 5, 5, 6
Range: 2, 3, 3, 7
Is this a function?