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
joja [24]
3 years ago
13

A well-designed experiment should have which of the following characteristics?

Mathematics
1 answer:
igor_vitrenko [27]3 years ago
5 0

Answer:

The answer is E: I, II, and III

Step-by-step explanation:

The three major features of a well designed experiment are:

1. Replication: If an experiment cannot be replicated, then it is not a well-designed experiment. Replication is one of the major characteristics of a well designed experiment

2. Control: A well designed experiment must have a control. Control, in an experiment, can be referred to as the steps taken to curb the impact of extraneous variables

3. Randomization: Subjects are expected to be randomly assigned to different groups.

You might be interested in
How do I find the variable?<br><br> N x 1/5 = 2/15<br><br> N / 1/5 = 1/3
algol [13]
First you need to get all variables on one side. You do that by multiplying the reciprocal of the fraction to everything.
N(5/1) x 1/5(5/1)=2/15(5/1)
5n=2/15 x 5/1
Then solve the multiplication problem
5n= 10/15
Then you should reduce the fraction
5n=2/3
Then divide both sides by 5
5n/5=N
2/3 divided by 5 =2/15

N=2/15




4 0
3 years ago
23 A racing car used 255 litres of fuel to complete a 340 km race. On average, how many litres of fuel did the car use every 100
stealth61 [152]
255 litres for 340 km
for 1 km = 255/340 litres
for 100 km = 255/340 * 100 = 75 litres
7 0
2 years ago
Read 2 more answers
A triangle has vertices at (1,10), (-5,2), and (7,2). What is its orthocenter. Show your work.
kondor19780726 [428]

Answer:

Question: What is the orthocenter of a triangle with the vertices (-1,2) (5,2) and (2,1)?

The coordinates of point A are (-1,2), point B are (5,2), and point C are (2,1).

The orthocent is the intersection of the three altitudes. An altitude goes from a vertex and is perpendicular to the line containing the opposite side.

In the coordinate plane the equations of the altitudes can be found and then a system of equations can be solved.

Altitude 1. From point C perpendicular to the line containing side AB.

Slope of line AB is 0 (horizontal line), a vertical line is perpendicular to a horizontal line. Thus, the equation of altitude 1 is  x=2 .

Altitude 2. From point B perpendicular to the line containing side AC.

Slope of line AC is  −13 , the slope of a line perpendicular to line AC is 3. The equation of altitude 2 is  y=3x−13  

Altitude 3. From point A perpendicular to the line containing side BC.

Slope of line BC is  13 , the slope of a line perpendicular to line BC is  −3 . The equation of altitude 3 is  y=−3x−1  

The orthocenter is the point where all three altitudes intersect.

x=2  

y=3x−13  

y=−3x−1  

Use substitution to solve the first two equations  y=3(2)−13=−7  

The orthocenter is the point  (2,−7)  

we did not need the third equation, but we can use it as a check, plug the coordinates into the third equation:

−7=−3(2)−1  

−7=−6−1  

−7=−7  it works.

3 0
3 years ago
A triangle has sides of length 48 mm, 5cm and 1.4 cm.
cricket20 [7]

Answer:

<u><em>The triangle is a right-angled triangle. </em></u>

Step-by-step explanation:

<em>Hi there,</em>

<em></em>

<em>I have included the answers as image format to the answers.</em>

<em>If you found my answer helpful, then please do me a favor by marking me as the brainliest as it means a lot to me.</em>

<em></em>

<em>From a fellow student,</em>

<em>Good day ahead, :)</em>

<em>Dan</em>

5 0
2 years ago
First right=brainliest:)))
Sophie [7]

Answer:

-4,7

Step-by-step explanation:

add both to get y=7

then sub y in 2 to get 8x+42=10

8x=-32

x=-4

3 0
3 years ago
Other questions:
  • Order the following from Least to Greatest (draw a number line)<br><br> l-6l, -3, 0, -1
    10·1 answer
  • I need Help!!!!!! Correct answers gets 10 Points.
    15·2 answers
  • I realllllly need help thankyou
    15·1 answer
  • Paul, who is self employed, placed $30,000 in an account that pays 6% annual interest, compounded quarterly. How much interest w
    6·1 answer
  • At which points is this graph discontinuous? List your answers in increasing order.
    12·2 answers
  • 100 POINTS HELP PLEASE ONE HUNDRED POINTSSS identify each measurement as a diameter, radius, or circumference of the circular ob
    6·2 answers
  • (2⁵ + 14 ÷ 2) • 2 pls help ;-;
    13·1 answer
  • Please help me out please
    5·1 answer
  • one strand of lights for a Christmas tree 250 light bulbs. If 20% of the light bulbs are green how many light bulbs on the stran
    13·1 answer
  • When interrogating paragraphs, if the paragraph gives an opposite argument to the one before it, then _____.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!