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Mamont248 [21]
3 years ago
6

A train traveled 300 miles at a constant speed. It took 5 hours. What is the constant of proportionality that describes the trai

n's speed?
Mathematics
1 answer:
Fudgin [204]3 years ago
5 0

Answer:

60 miles an hour

Step-by-step explanation:

^^^^^^^^

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\large \underline{ \mathbb{QUESTION:}}

The lifeguard of the beach resort is on his post which is 4 m high. A boy in the pool is 9 meters away from him. Find the angle of depression from the lifeguard to the boy.

\large\underline{ \mathbb{ANSWER  \: \& \: SOLUTION:}}

\large \tt{ tan \: x \:  =  \:  \frac{opposite}{adjacent} }

\large \tt{tan  \: x \:  =  \:  \frac{4}{9}}

\large \tt{ \:   \: \:  \:   \:  \:  \: \: x \:  =  \:  tan ^{ - 1}  \:  (0.444)}

\large \tt {\:  \:  \:  \:  \:  \:  \:  \: x \:  =  \: 23.96 ^{o} }

\:\:\:\:\:\:\:\: \large \boxed{\tt{\red{  x \:  =  \: 24 ^{o} }}}

Therefore the angle of depression from the lifeguard to the boy is 24°.

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{x}^{2}  - 18x - 21

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{x}^{2}  + 3 - 6(3x + 4)

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\boxed{\green{=  {x}^{2}  - 18x - 21}}

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