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2 years ago

What variable did the researchers intentionally vary in the experiment, and what are the units for this variable?.

1 answer:

3 0

The variable the researchers intentionally varied in the experiment is time and the units of the variable is mins.

<h3>What is an independent variable?</h3>

The independent variable is the variable that the researcher varies or changes or manipulates in the course of the experiment. The independent variable usually have a direct effect on the dependent variable.

With the passage of time, the level of concentration increases. This means that time is the independent variable and concentration is the dependent variable.

Please find the required table attached. To learn more about independent variables, please check: brainly.com/question/26287880

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)which of the following correctly uses absolute value to show the distance between −70 and 15? |−70 − 15| = |−85| = −85 units |−

Crazy boy [7]

<span>|−70 − 15| = |−85| = 85 units</span>

3 0

3 years ago

Read 2 more answers

Which value is equal to -18 divided by -9?

trapecia [35]

Answer:

$\huge \boxed{ \boxed{2}}$

Step-by-step explanation:

<h3>to understand this</h3><h3>you need to know about:</h3>

PEMDAS
integer

<h3>tips and formulas:</h3>

$\frac{ - a}{ - b} = c$

<h3>let's solve:</h3>

$\sf step - 1 : define$

$\sf\frac{ - 18}{ - 9}$

$\sf step - 2 : solve$

$\sf simplify \: divisio n : \\ \frac{ - 18}{ -9 } \\ = 2$

6 0

3 years ago

Slove the simoltanous equation by using substitution or elimination method 5x-3y=1 3x+2y=1<br>

xxTIMURxx [149]

<u>By substitution method </u>

5x - 3y =1

3x + 2y = 1

_____o____o____

$5x - 3y = 1 \\ 5x = 1 + 3y \\ x = \frac{1 + 3y}{5}$

______o____o_____

$3x + 2y = 1 \\ 3( \frac{1 + 3y}{5} ) + 2y = 1 \\ \frac{3 + 9y}{5} + 2y = 1 \\ \frac{3 +9y + 10y}{5} = 1 \\ \frac{3 + 19y}{5} = 1 \\ 3 + 19y = (1)(5) \\ 3 + 19y = 5 \\ 19y = 5 - 3 \\ 19y = 2 \\ y = \frac{2}{19}$

______o_____o____

$x = \frac{1 + 3y}{5} = \frac{1 + 3 \frac{2}{19} }{5} \\ x = \frac{1 + \frac{6}{19} }{5} = \frac{ \frac{19 + 6}{19} }{5} = \frac{ \frac{25}{19} }{5} \\ x = \frac{25}{19} \div 5 \\ x = \frac{25}{19} \times \frac{1}{5} \\ x = \frac{5}{19}$

I hope I helped you^_^

7 0

3 years ago

What is the probability of selection for any man in a proportionate random sample, where a sample of 100 will be drawn from a po

kolbaska11 [484]

Working Principle: Stratified Random Sampling

nx = (Nx/N)*n

where:
nx = sample size for stratum x
Nx = population size for stratum x
N = total population size
n = total sample size

Given:

Nx = 100
N = 1000
n = 0.5*(1000) = 500

Required: Probability of Man to be selected

Solution:

nx = (Nx/N)*n
nx = (100/1000)*500 = 50 men

ny = (Nx/N)*n
ny = (100/1000)*500 = 50 women

Probability of Man to be selected = nx/(nx + ny)*100 = 50/(50+50)*100 = 50%

<em>ANSWER: 50%</em>

7 0

3 years ago

Help me in a b and c pleaseeeeee

joja [24]

Answer:

a. The x coordinates of the vertices are transformed as follows: (x, y) --> (−x, y)

b. The y coordinates of the vertices don't change.

c. The image is reflected across the y-axis.

Step-by-step explanation:

The rule to follow for reflecting a figure across the y-axis is to take the original coordinate (x, y) and change it to (−x, y)

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2 years ago