First, find the length L^2+W^2=D^2 )L for length, W for width, D for diagonal) L^2=25^2-15^2=625-225=400 L=20 A=1/2 of L*W= (1/2)*20*15=150 square inches
You scored 18 points in your fourth game because if you played 4 games and got 12 points each game that equals 48 points all together and if the average is 10 points for the first 3 games that equals 30 points for the three games so 48-30=18