47inches in Cm. is C. 119.38cm
60 minutes in an hour
60 x 8 = 480
his class is 480 minutes long
It is B, the coefficient of the x-term. When you multiply this out, you get x*x+x*q+x*p+p*q, or x^2+x(p+q)+p*q
Notice how the x term is multiplied by p+q.
Hope this helps!