17 - (-8) - 15 - 3
1/3 +1/4 + 1/5
sin x = 5/13 cos x = 12/13
sin x = 5/13
if lg x = 16.25 find x
if log 10 x = 16.25 find x
9/2+7/2÷7/112
9/2+7/2÷7/12
