1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
VladimirAG [237]
4 years ago
5

In true experiments, subjects are put into control and experimental groups using _____________. Group of answer choices 1. Rando

m sampling 2. Random assignment 3. Self-selection 4. Chronological order
Mathematics
1 answer:
Ivanshal [37]4 years ago
7 0

To get the best results in an experiment the subjects should be picked randomly.

The answer would be 2. Random assignment.

You might be interested in
Find the area of the regular polygon. Give the answer to the nearest tenth
GarryVolchara [31]

Answer:

440.4ft

Step-by-step explanation:

:)

5 0
3 years ago
19 Julia is allowed to watch no more than 5 hours of television a week. So far this week, she has watched 1.5 hours. Write and s
nevsk [136]
19
If she has already watched 1.5 hours and she can only watch 5 hours per week, then we have the inequality:
1.5 + T ≤ 5
where T is is the number of hours she can watch more before reaching her limit

20
If he needs 100 points, already has 40 and earns 2 for every movie, we have the inequality:
40 + 2m ≥ 100
where m is the number of movies he needs to watch

21
We can have the equation:
x + 1 = x + 2 - 1
This would result to:
x + 1 = x + 1
which have the same terms on both sides.
Further, the equation would be:
0 = 0
5 0
3 years ago
Read 2 more answers
Points a, b, c are collinear. Point b is between A and C. AC=3x+3, ab=-1+2x, and BC=11. solve x.
romanna [79]
X is 7. Hope this helps! Photo above

5 0
3 years ago
Consider the function f(x) = x² – 3x – 4 and complete parts (a) through (C). (a) Find f(a+h); f(a+h)-f(a) (b) Find (c) Find the
Artist 52 [7]

Answer:

(a)

f(a+h)=a^{2} +2ah+h^{2} -3a-3h-4

(b)

f(a+h)-f(a)=2ah+h^{2} -3h

(c)

\frac{df(a+h)}{dx} \left \{ { \atop {a=7}} \right. =2h+11

Step-by-step explanation:

(a)

Simply evaluate (a+h) in the function:

f(a+h)=(a+h)^{2} -3(a+h)-4=a^{2} +2ah+h^{2} -3a-3h-4

(b)

Evaluate (a) in the function:

f(a)=a^{2} -3a-4

Using the previous answers lets calculate f(a+h)-f(a)

f(a+h)-f(a)=a^{2} +2ah+h^{2} -3a-3h-4-(a^{2} -3a-4)=2ah+h^{2} -3h

(c) To find the rate of change of f(a+1) when a=7 we need to calculate its derivate at that point:

\frac{df(a+h)}{dx} \left \{ { \atop {a=7}} \right. =2a+2h-3=2(7)+2h-3=2h+14-3=2h+11

7 0
4 years ago
Use scientific notation to estimate the number of inches in 1,225 miles.
Zolol [24]
In scientific notation, to obtain the original whole number. Move the decimal to the left if the exponent is negative and to the right if the exponent is positive.
So 1 inch = .00001578 miles
1225 / .00001578 = 77629911.28

To obtain the answer in scientific notation, move the decimal to the left until you have a single digit whole number and the rest of teh digits are to the right of the decimal. In this case 7 places. Now show it multiplied by 10 to an exponent equal to the number of places you moved the decimal. In this case the 7th exponent.

7.763 x 10^7
6 0
4 years ago
Other questions:
  • Answer fast and I'll mark brainliest!
    10·1 answer
  • Graph the image of the given triangle under a dilation with a scale factor of –4 and center of dilation (0,0).
    12·1 answer
  • Always? Sometimes? Never? <br> Explain
    12·1 answer
  • Which second degree polynomial function f(x) has a lead coefficient of 3 and roots 4 and 1?
    12·2 answers
  • Mavis made $145 in commissions one week for selling shoes. Her commission rate is 5% of the total amount that she sells. What wa
    6·1 answer
  • I don’t get it I need hey
    11·2 answers
  • Which graph represent y= x2 - 2x -3
    9·1 answer
  • Sebuah LSM akan mengirim 5 utusan untuk mengikuti suatu konferensi. Kelima utusan tersebut terdiri dari 3 wanita dan 2 pria. Kel
    15·1 answer
  • A bike helmet which usually costs $57 is discounted 20%. About how much is the discount amount?
    11·1 answer
  • Help quick with this question
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!