Add the estiment nd the real number too 726 times 5

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?

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

With finding limits of multi variable !