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Inga [223]
3 years ago
8

Why do scientists need control groups?

SAT
1 answer:
lubasha [3.4K]3 years ago
3 0

Explanation:

A scientific control group is an essential part of many research designs, allowing researchers to minimize the effect of all variables except the independent variable. The control group, receiving no intervention, is used as a baseline to compare groups and assess the effect of that intervention.

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A group of campers walked at a speed of 4. 5 mph from their campsite to a rest area. Their return trip to the campsite took 15 m
tia_tia [17]

The distance between the campsite and the rest area is 9 miles.

The given parameters:

  • <em>Initial speed of the campers, u = 4.5 mph</em>
  • <em>Final speed of the campers, v = 4 mph</em>

<em />

Let the time of motion from the campsite to rest area = t (hours)

Time for return trip = t hours +  15 mins

                               = (t + 0.25) hours

Let the distance between the campsite and rest area = d

d = 4.5t

d = 4(t + 0.25)

4.5t = 4(t + 0.25)

4.5t = 4t + 1

4.5t - 4t = 1

0.5t = 1

t = 2 hours

The distance between the campsite and the rest area is calculated as follows;

d = 4.5t

d = 4.5 x 2

d = 9 miles

Thus, the distance between the campsite and the rest area is 9 miles.

Learn more about distance and speed here: brainly.com/question/2854969

5 0
3 years ago
Who is the artist of the image above? a. Christopher wren b. Georges de la tour c. Nicolas poussin d. Antoine le nain.
Romashka-Z-Leto [24]

Georges de la tour is the artist of the image above.

Georges de La Tour (13 March 1593 – 30 January 1652) was a French Baroque painter. He spent most of his working life in the Duchy of Lorraine in France between 1641 and 1648. He painted mostly religious chiaroscuro scenes lit by candlelight.

La Tour is best known for the nocturnal light effects which he developed much further than his artistic predecessors had done.

Find out more on Georges de La Tour at: brainly.com/question/2910849

6 0
2 years ago
According to the article "Introduction to Modern Drama Study," which of the following best explains why more women began to emer
max2010maxim [7]

Answer:

B. Women began to realize that they could take control of their lives and choose how they wanted to live.

Explanation:

got it right on the test

8 0
2 years ago
Thanks for helping. really thank you it was very helpful. THANKS A LOT.
Katyanochek1 [597]
What is your question
8 0
3 years ago
Read 2 more answers
17.1 understanding polynomial expressions answer key
KiRa [710]

The identification of the polynomial expression is as follows:

  • Binomial, degree 2
  • Trinomial degree 6
  • Monomial, degree 4

<h3>What is a polynomial?</h3>

A polynomial shows the relation of more than two algebraic terms and the sum of powers of a polynomial in more than one variable. Polynomials are represented in terms of \mathbf{kx^n};

where;

  • k = any number
  • n = positive integer.

The degree of a polynomial expressions can be:

  • Monomial
  • Binomial
  • Trinomial

Let's assume we have the following equation;

  • 6b² - 7
  • x²y - 9x⁴y²+ 3xy
  • 35r³s

Their degree of polynomial expression is:

  • Binomial, degree 2
  • Trinomial degree 6
  • Monomial, degree 4

Learn more about polynomial here:

brainly.com/question/4142886

3 0
2 years ago
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