Tell what property you used to solve x - 15 = 3

At dinner, 2/5 of the people had fish and 1/3 had chicken. if everyone else had lamb, what fraction of the people had lamb? and if 40 people had lamb , calculate the total number of people at the dinner.

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults.how many students and adults went if the ticket charge was $42.75

Two triangles can be formed with the given information. use the law of sines to solve the triangles. b = 49°, a = 16, b = 14