Please help, I'll give brainliest!

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

Mrs.sling bought a pound of green beans for $1.80. how much will mrs.tennison pay for 3 1/2 pounds of green beans?

Last week , donnell practiced the piano 3 hours longer than marcus . together, marcus and donnell practiced the piano 11 hours . for how many hours did each young man practiced the piano