What are the missing side lengths for triangle ABC?

The hypotenuse of an isosceles right triangle is $14\sqrt 2$. what is the area of the triangle?

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?

Ateacher brought a pack of 17 batteries . each calculator uses 3 batteries . how many calculator can the teacher fill with batteries