Sin V = opp/hyp
Sin 60 = opp/18
opp = sin 60 x 18
opp = 15.6
opp = 9 root 3
Answer:
D
27 cubic inches
Because you multiply 3x3x3=27
The train is going 90 mph.
This one is easy to explain, if you have 90 miles travelled in one hour of time, then you have 90 mi/1 hour, or 90 mph.