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Kazeer [188]
3 years ago
12

Help please!!!!! I really don't understand

Mathematics
1 answer:
ololo11 [35]3 years ago
7 0
I believe it would be the last one
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the base of a 15 ft ladder is 12 feet from the base of a building. a 25 foot ladder rests against the building at the same angle
castortr0y [4]

Answer:

The ladder reaches 15ft

Step-by-step explanation:

In the first case we have

cos\theta =\frac{12}{15}

In second case let the height be x

We have

sin\theta =\frac{x}{25}

We know that

cos\theta =\frac{12}{15}\\\\sin\theta =\sqrt{1-\frac{12^{2}}{15^{2}}  } \\\\sin\theta =\sqrt{\frac{81}{225}  } \\\\sin\theta =\frac{9}{15}  }

Substituting

\frac{9}{15} =\frac{x}{25}\\\\x=\frac{25\times9}{15} =15

The ladder reaches 15ft

6 0
2 years ago
Plz help quick need before 7:30
Andre45 [30]
the inequality symbol with a line underneath, u would have to color in the dot
6 0
4 years ago
Read 2 more answers
Solve the system of equations 2r + 2s = 50 and 2r – s = 17.
shutvik [7]
R = 14
s = 11

2(14)+2(11)=50
28+22=50

2(14) - 11 =17
28 - 11 =17
3 0
3 years ago
Read 2 more answers
The time taken to complete a motorcycle race is normally distributed, with an average time (µ) of 2.5 hours and a standard devia
torisob [31]

Using the normal distribution, there is a 0.5398 = 53.98% probability that a randomly selected cyclist will take at least 2.45 hours to complete the race.

<h3>Normal Probability Distribution</h3>

The z-score of a measure X of a normally distributed variable with mean \mu and standard deviation \sigma is given by:

Z = \frac{X - \mu}{\sigma}

  • The z-score measures how many standard deviations the measure is above or below the mean.
  • Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.

The mean and the standard deviation are given, respectively, by:

\mu = 2.5, \sigma = 0.5

The probability that a randomly selected cyclist will take at least 2.45 hours to complete the race is <u>one subtracted by the p-value of Z when X = 2.45</u>, hence:

Z = \frac{X - \mu}{\sigma}

Z = \frac{2.45 - 2.5}{0.5}

Z = -0.1

Z = -0.1 has a p-value of 0.4602.

1 - 0.4602 = 0.5398.

0.5398 = 53.98% probability that a randomly selected cyclist will take at least 2.45 hours to complete the race.

More can be learned about the normal distribution at brainly.com/question/4079902

#SPJ1

3 0
2 years ago
NEED NOW!!!
Temka [501]

Answer:

The first one: y - 2 = -5(x - 2)

Step-by-step explanation:

5 0
3 years ago
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