There are 7 blue balls, 8 purple balls, and 15 red balls in a bag. What is the probability of picking up one purple ball out of the bag without looking?

If the hypotenuse of a right triangle is equal to hypotenuse of another right triangle then the triangles are congruent.

B.

If two sides and the included angle of a triangle are respectively equal to the two sides and the included angle of another triangle, the triangles are congruent.

C.

If two triangles are congruent then their corresponding sides and their corresponding angles are equal.

D.

If the hypotenuse and an acute angle of a right triangle is equal to the hypotenuse and corresponding acute angle of another right triangle then the triangles are congruent.

A rectangle and a square have the same area. If the side of the square is 320 meters and the width of the rectangle is 64 meters, find the length of the rectangle.

Nicole rolls a cube in which the letters L, U, F, S, O and D appear on faces 1, 2, 3, 4, 5, and 6, respectively. What is the fraction of symmetric letters (either horizontal or vertical) on the cube?