Sin(0/2)=1/2 Its Precal please help

Aswimming pool is a rectangle with semicircles on the end. the rectangle is 12 meters wide and 30 meters long. the diameter and width of the swimming pool are equal. sketch and label an overhead diagram of the swimming pool. find the area of the swimming pool floor.

Factor the polynomial, if possible. if the polynomial cannot be factored, write prime. 9n^3 + 27n^2 – 25n – 75

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i