What is 9 and 5/6 minus 5 and 3/4

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

Find dy/dx using implicit differentiation ln(20+e^xy)=y

Lucy is a dress maker. she sews \dfrac47 7 4 of a dress in \dfrac34 4 3 hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable