All categories

3 years ago

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

You might be interested in

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

Read 2 more answers