What is 432 divided by 12 I don’t know please help I have to learn

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?

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)