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Natali5045456 [20]
3 years ago
14

Determine whether the study depicts an observational study or an experiment. Eighth dash grade students are randomly divided int

o two groups. a. One group is taught English using traditional techniques. b. The other is taught English using a reform method. After 1 year comma each group is given an achievement test to compare its proficiency with that of the other group. Choose the correct description of the study.
Mathematics
1 answer:
Marina86 [1]3 years ago
3 0

Answer:

The study is an experiment.

Step-by-step explanation:

From the information provided, Eighth-grade students are randomly divided into two groups.

==> The first group is taught English using traditional techniques.

==> The second group is taught English using a reform method.

The main goal is to compare the proficiency in English of the two groups. This is purely an experimental study. In this case, human experiment.

The experimental tools is the English techniques being served or taught and the experimental units are the Eighth-grade students which were grouped into 2 groups and served different techniques.

At the end of the study, the researchers wish to know the most effective or efficient method of teaching English to gain excellent proficiency of the language. They should be able to know whether Traditional techniques is better than the Reform method or vice versa.

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A circle has a radius of 5 in. A central angle that measures 150° cuts off an arc.
Slav-nsk [51]

Answer:

Part 1) The exact value of the arc length is \frac{25}{6}\pi \ in

Part 2) The approximate value of the arc length is 13.1\ in

Step-by-step explanation:

step 1

Find the circumference of the circle

The circumference of a circle is equal to

C=2\pi r

we have

r=5\ in

substitute

C=2\pi (5)

C=10\pi\ in

step 2

Find the exact value of the arc length by a central angle of 150 degrees

Remember that the circumference of a circle subtends a central angle of 360 degrees

by proportion

\frac{10\pi}{360} =\frac{x}{150}\\ \\x=10\pi *150/360\\ \\x=\frac{25}{6}\pi \ in

step 3

Find the approximate value of the arc length

To find the approximate value, assume

\pi =3.14

substitute

\frac{25}{6}(3.14)=13.1\ in

7 0
3 years ago
which represents the solution(s) of the system of equations, y=x^2-2x-15 and y=8x-40? determine the solution set algebraically
Harrizon [31]
y=x^2-2x-15 (1) y=8x-40 (2)

8x-40=x^2-2x-15
X^2+10x-25=0
(x-5)^2
×=5 y=0
7 0
3 years ago
What is the prime factorization of 35? 1 • 35 12 • 5 • 7 1 • 5 • 7 5 • 7
Nonamiya [84]

Answer:

  5·7

Step-by-step explanation:

From your knowledge of multiplication tables, you know that ...

  5×7 = 35

Both 5 and 7 are prime numbers, so that is the prime factorization.

4 0
3 years ago
Okay i need help finding y x 6 for y = 2/3 please help
aleksandr82 [10.1K]
First, you need to substitute y for 2/3:

2/3 • 6

Next, change 6 into a fraction and multiply straight across:

2/3 • 6/1
12/3

Finally, simplify it to its simplest form:

4
Your answer should be 4.
Hopefully that helped!
4 0
3 years ago
Use the distributive property to rewrite the algebraic expression.<br> 3(x + 7)
Oksana_A [137]
The answer is: 3x+21
8 0
3 years ago
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