List the numbers that have 30 as a multiple

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

(60 points) explain this in detail