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3 years ago

A study which reviews the traffic video of an intersection during rush hour to determine how many people

SAT

1 answer:

telo118 [61]3 years ago

5 0

Answer:

The correct option is;

D) Observational study

Explanation:

In an observational study, the researcher observes, notes and record the an occurrence of events which are due to the existence of a condition, test, risk factor, such that the experimental units are apparently out of the control of the researcher, or there are no researcher intervention in the study, due to either physical constraint or laid down ethics.

In the question, the researcher observes to determine the the number of people that run a light through pre recorded traffic video providing a physical restraint which makes it an observational study.

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Lydia graphed δlmn at the coordinates l (0, 0), m (2, 2), and n (2, −1). She thinks δlmn is a right triangle. Is lydia's asserti

nadya68 [22]

No product results in -1, hence δlmn is NOT a right triangle showing that lydia's assertion is incorrect

<h3>Perpendicular lines</h3>

In order to determine whether triangle lmn is right-angled, we need to determine the slope of lm, ln, and mn first as shown:

For the slope of lm:

$m_{lm} = \frac{2-0}{2-0}\\ m_{lm} =2/2\\m_{lm} =1$

For the slope of ln:

$m_{ln} = \frac{-1-0}{2-0}\\m_{ln} =-1/2\\$

For the slope of mn:

$m_{mn} = \frac{-1-2}{2-2}\\m_{ln} =-3/0 = \infty\\$

If any of the two lines is perpendicular, hence the triangle lmn is right-angled.

To check, we will take the product of the slopes and see if it is equivalent to -1.

Product of slope lm and ln

$m_{lm}\times m_{ln} = 1 \times -1/2\\m_{lm}\times m_{ln} = -1/2$

Since no product results in -1, hence δlmn is NOT a right triangle showing that Lydia's assertion is incorrect

Learn more on slopes here: brainly.com/question/3493733

8 0

2 years ago

Read 2 more answers

wariber [46]

<h2>Right answer: I and II only </h2>

If we already have the formula to find how temperature measured in degrees Fahrenheit, relates to a temperature in degres Celsius:

$C=(F-32)\frac{5}{9}$ (1)

We can know the formula to find how temperature measured in degrees Celsius, relates to a temperature in degres Fahrenheit, only by isolating F:

$F=(\frac{9}{5}C)+32$ (2)

Having both formulas, let’s begin:

I) If we want to prove that a temperature increase of 1 degree Fahrenheit is equivalent to a temperature increase of 5/9 degree Celsius:

Beginning with $1\ºF$ :

$C=(1\ºF-32)\frac{5}{9}=-17.22\ºC$

This means: $1\ºF=-17.22\ºC$

Now we are going to increase 1 degree Farenheit. In other words, we are going to use $2\ºF$ :

$C=(2\ºF-32)\frac{5}{9}=-16.66\ºC$

This means: $2\ºF=-16.66\ºC$

Calculating the difference between $-16.66\ºC$ and $-17.22\ºC$ :

$-16.66\ºC-(-17.22\ºC)=0,55\ºC$ >>>>This is equal to 5/9 degree Celsius, hence is correct

II) If we want to prove that a temperature increase of 1 degree Celsius is equivalent to a temperature increase of 1.8 degrees Fahrenheit:

Beginning with $1\ºC$ :

$F=(\frac{9}{5}1\ºC)+32$

$F=33.8\ºF$

This means: $1\ºC=33.8\ºF$

Now we are going to increase 1 degree Celsius. In other words, we are going to use $2\ºC$ :

$F=(\frac{9}{5}2\ºC)+32$

$F=35.67\ºF$

This means: $2\ºC=35.67\ºF$

Calculating the difference between $35.67\ºF$ and $33.8\ºF$ :

$35.67\ºF-33.8\ºF=1.8\ºF$ >>>>This is a proof of the statement, hence is also correct.

<h2 />

III) If we want to prove that a temperature increase of 5/9 degree Fahrenheit is equivalent to a temperature increase of 1 degree Celsius:

Beginning with $1\ºC$ :

$F=(\frac{9}{5}1\ºC)+32$

$F=33.8\ºF$

This means: $1\ºC=33.8\ºF$

Now we are going to add $\frac{5}{9}\ºF$ :

$33.8\ºF+\frac{5}{9}\ºF=34.35\ºF$

And use this value in the Celsius formula:

$C=(34.35\ºF-32)\frac{5}{9}=1.30\ºC$

This means: $1.30\ºC=34.35\ºF$

In other words: An increase in 5/9 degree Fahrenheit is equivalent to a temperature increase of 1.30 degree Celsius, <u>not 1 degree Celsius</u>.

Therefore this statement is incorrect.

4 0

3 years ago

John has been having difficulties getting out of bed. He is not interested in going out with friends, and hardly ever answers th

sergejj [24]

Depression if this is true you need to help him

7 0

3 years ago

Triangle PQR has right angle Q. If sin R = 4/5<br> what is the value of tan P?

icang [17]

By applying Pythagorean' theorem, the value of tanP is equal to 3/4.

<h3>How to determine the value of tan P?</h3>

Since triangle PQR has right-angle Q and sinR = 4/5, we have:

sinR = Opp/hyp = 4/5

tanP = Opp/Adj = QR/4

Next, we would determine the length of QR by applying Pythagorean' theorem:

PR² = QR² + PQ²

5² = QR² + 4²

25 = QR² + 16

QR² = 25 - 18

QR = √9

QR = 3 units.

For the value of tanP, we have:

tanP = 3/4.

Read more on Pythagorean theorem here: brainly.com/question/23200848

#SPJ1

3 0

2 years ago

The energy of the electromagnetic wave is emitted in short bursts called _________.

Tema [17]

The energy of an electromagnetic wave is typically emitted in short bursts referred to as photons.

<h3>What is electromagnetic energy?</h3>

Electromagnetic energy can be defined as form of energy that is primarily carried by electromagnetic waves such as:

Gamma rays

x-rays.

This ultimately implies that, an electromagnetic energy refers to a form of energy that typically moves as particles at the speed of light, which is about three hundred million meters per seconds (3 × 10⁸ m/s).

In conclusion, we can infer and logically deduce that the energy of an electromagnetic wave is typically emitted in short bursts referred to as photons.

Read more on energy here: brainly.com/question/9221254

#SPJ1

3 0

2 years ago