Can you do step by step I wasn't paying attention in class

Solve the triangle. a = 21°, c = 105°, c = 5

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)

Prove the converse of the pythagorean theorem using similar triangles. the converse of the pythagorean theorem states that when the sum of the squares of the lengths of the legs of the triangle equals the squares length of the hypotenuse, the triangle is a right triangle. be sure to create and name the appropriate geometric figures.