Find the area of a circle with radius, r = 19cm.
Give your answer rounded to 3 SF.

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?

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0