Find the third side of a right triangle that has a leg measuring 5 cm and hypotenuse measuring 13 cm.

URGENT

Find the value of the cosine for angle a

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

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?