Can someone plss help me with this question (x-11.2=10.3)

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

Hurry which expression is equivalent to 3√x^5y?

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)