The answer would be 73. if you don't believe me then divide 511 by 7 or multiply 73 by 7. your welcome
The power Needed to drive the boat at 19 knots is 24
For the question on the picture with -3/2 the answer is x=12, but the one you typed with -3/4 the answer is x=24
Answer:
Let x=sinθ
2sin²θ = 5sinθ - 3
2x²=5x-3
2x²-5x+3=0
(2x-3)(x-1)=0
2x-3=0 or x-1=0
x=3/2 or x=1
sinθ=2/3 or sinθ=1
θ=arcsin(2/3) or θ=arcsin(1)
θ=0.729727656 or θ=1.57079633=π/2