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zloy xaker [14]
3 years ago
12

A local university produces a study in which it chose 1000 students to participate the study asked each student to write down th

e number of hours spent studying in one week period which element of expire the design is known to be part if this study
a. blinding
b. replication
c. randomization
Mathematics
1 answer:
IgorLugansk [536]3 years ago
6 0
A. Randomization
The selection is based on random selection
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Dimas [21]

Answer:

Step-by-step explanation:

The directrix is a vertical line, so the parabola is horizontal. The focus lies to the left of the directrix, so the parabola opens to the left.

For a left-opening parabola:

x = a(y-k)²+h,

a < 0,

vertex (h,k)

focal length p = 1/|4a|

focus (h-p, k)

directrix: x=h+p

Apply your data

focus (1,-4)

directrix x=2

vertex (1.5,-4).

focal length p = 0.5

a = -1/|4p| = -½

x = -½(y-2)²+ ½

8 0
3 years ago
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Please help me!!!!!!!!
sergejj [24]

Answer:

Angle 1: 105

Angle 2: 75

Step-by-step explanation:

You know 2 is 75 because both lines are parallel.

To get 1 you subtract 75 from 180.

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3 years ago
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3)June 2019-In the diagram below of AABC, D is a
Alexeev081 [22]

Answer:

BC = 23.8

Step-by-step explanation:

See the diagram attached.

Given AC ║ DE and BD = 5, DA = 12 and BE = 7.

We have to find BC.

Since, AC ║ DE, so, Δ ABC and Δ DBE are similar.

If two triangles are similar then the ratio of their corresponding sides remains the same.

Hence, \frac{BD}{BA} = \frac{BE}{BC}

⇒ \frac{5}{12 + 5} = \frac{7}{BC}

⇒ BC = \frac{7 \times 17}{5} = 23.8 (Answer)

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3 years ago
Select all the equations that are true when x = 6.
tangare [24]
17 - x = 11
X➗2 = 3
5 + x = 11
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Amy's salary is 40,000 in her first year on the job with a 2,000 rise every year there for
Elena-2011 [213]

Answer:

F

Step-by-step explanation:

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3 years ago
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