Free points what's 1+1

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?

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits