Check the picture below.
now, the "x" is a constant, the rocket is going up, so "y" is changing and so is the angle, but "x" is always just 15 feet from the observer. That matters because the derivative of a constant is zero.
now, those are the values when the rocket is 30 feet up above.

The correct answer is only A, because you need the tenths place to be greater than the number on the left, and not just the hundredths place.
P.S. Even though I'm a beginner, I took Multi-Variable calculus in 12th grade.
P.P.S. STOP PUTTING ON RANDOM ANSWERS ON QUESTIONS JUST SO YOU CAN GET THE POINTS!!!!!!
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Answer:
Let's simplify step-by-step.
− x + 3 − ( x − 5 )
Distribute the Negative Sign:
= − x + 3 + − 1 ( x − 5 )
= − x + 3 + − 1x + ( − 1 ) ( − 5 )
= − x + 3 + − x + 5
Combine Like Terms:
= − x + 3 + − x + 5
= ( − x + − x ) + ( 3 + 5 )
= − 2x + 8
Answer:
= − 2x + 8
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64-40= 24. Play offense
24:40
Simplify both sides by dividing by 8
= 3:5