The sum of 4 thirteens and 16 thirteens, need answer ASAP :(

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

Turner's mom measured his room to see how long the wallpaper border needed to be. if two walls are 15 feet long and two walls are 12 feet long, how long should the strip of border be cut?

What is the remainder when 2872 is divided by 76? a) 51 b) 57 c) 60 d) 63