If F is a 2×3 matrix and G is a 3×2 matrix, what is the size of GF​

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?

How many days was the temperature above 90 degrees?

Determine domain and range, largest open interval, and intervals which function is continuous.