A tank can fill by the taps in 8 hours and can be emptied by the other taps in 10 hours. How long will it take to fill the tank if both the taps are opened together?​

12 point are triangles pqr and stu congruent? what is the congruency that proves they are congruent? what is the perimeter of triangle pqr?

Taking algebra two apex courses and need with these questions

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?