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3 years ago

Can someone help pleaseee

Mathematics

1 answer:

RoseWind [281]3 years ago

4 0

Step-by-step explanation:

7-3cosx=9sin²x

[sin²x=1-cos²x]

7-3cosx=9-9cos²x

9cos²x-3cosx-2=0

let cosx=t

9t²-3t-2

by quadratic formula,

t=(3±9)/2·9

=> t=2/3 or t=-1/3

thus,

x=acos(2/3) or x=π- acos(1/3)

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solmaris [256]

Answer:

The probability that a vehicle would be involved in a tire-related accident is $P(TRA)=8x10^{-5}$

Step-by-step explanation:

We need to calculate the probability that a vehicule would be involved in a tire-related accident.

We know that, given a tire-related accident (TRA), the probability of it being deadly (D) is 0.05. That is:

$P(D|TRA)=0.05$

We also know that the probability of being involved in a deadly tire-related accident is 0.000004 . We can express that as the probability of having a TRA multiplied by the probability of it being deadly:

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Merging the two expressions we have:

$P(TRA)=0.000004/P(D|TRA)=0.000004/0.05=0.00008=8x10^{-5}$

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3 years ago

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Can someone help pleaseee​

Can someone help pleaseee