456.05 which digit is in the tenths place

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

It took alice 5 5/6 hours to drive to her grandparents' house for . on the way home, she ran into traffic and it took her 7 3/8 hours. how much longer did the return trip take? write your answer as a proper fraction or mixed number in simplest form. the trip home took __hours longer. ?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).