Your answers all seem correct.
Distance = velocity * time
= 3 * 10^8 * 8.64 * 10^4
= 2.592 * 10^13 meters (answer)
51= 1/2(160-x)
102=160-x
x=160-102=58
The ratios of side lengths in a 30-60-90 triangle are 1 : √3 : 2.
The longer leg is ...
B: 2 times the length of the shorter leg