50 + 6.25x < = 100
6.25x < = 100 - 50
6.25x < = 50
x < = 50 / 6.25
x < = 8....answer is A
You have to consider your input
f(x)=6x
f(2)=6(2)
f(2)=12
Answer:
a=21.1
Step-by-step explanation:
You can use the given (incorrect) equation and fill in the value of t to find h:
h = 12.5 +9sin(750(3.5)) = 3.68 . . . . feet
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Or, you can use the correct equation, or just your knowledge of revolutions:
h = 12.5 +9sin(750(2π·3.5)) = 12.5 . . . . feet
in 3.5 minutes at 750 revolutions per minute, the propeller makes 2625 full revolutions, so is back where it started — at 12.5 feet above the ground.