Find all solutions (real and imaginary) by factoring: x^4 - 5x^2 + 4

You are cycling around europe with friends. a cycling festival is starting soon in barcelona. it will take 4.5 hours to cycle there. how many minutes in total is this?

If you have the following equation, 2/3x+5/6-x=2-3/4x what would you multiply each term by to get rid of all the fractions

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.