Identify whether each of the following equations has a unique solution, no solution, or infinitely many solutions.

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

Elena is paid a constant rate for each hour she works. the table shows the amounts of money that elena earned for various amounts of time that she worked.

Peter measures the angles in a triangle. he finds that the angles are 95, 10 and 75. is he correct? explain your answer