Which expression has the same value as -3/4-(2-3/8)+3/2

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?

Using only odd number for numerators write two different subtraction problems that have a difference of 3/4

The equation of a parabola is given. y=18x2+4x+20 what are the coordinates of the focus of the parabola?