Find YZ.
wx=11x+1
Zy=19x-31

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

The train station clock runs too fast and gains 5 minutes every 10 days. how many minutes and seconds will it have gained at the end of 9 days?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36