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3 years ago

11

Find −1/5+17/10. Please help me!

1 answer:

alina1380 [7]3 years ago

7 0

I got 1.5, but I could be wrong.

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A group of researchers is designing an experiment to test whether an herbal supplement will help people lose weight. The researc

PilotLPTM [1.2K]

Answer:

Randomization removes lurking variables and biases.

Step-by-step explanation:

In case of an experimental design the groups are divided randomly.

Randomization is important so that there are no bias present in the study and to control any lurking variables. The controlling of the lurking variables provides an accurate result.

Lurking variables have a significant effect on the response variable. Presence of lurking variables can indicate a strong relation between variables or conceal any true relation between the variables.

Randomization thus gets rid of lurking variables and biases.

Also if randomization is used then each of the groups are similar in every way other than the fact that each group is provided with different treatment.

6 0

3 years ago

Need help with this!!! Only have a few minutes left!!!

Sliva [168]

Answer:

Step-by-step explanation:

7 0

2 years ago

Brad is planning to attend a public university after he graduates from high school in 2.5 years. He is devising a plan to save m

Reil [10]

Answer:

d. 313.33

Step-by-step explanation:

please rank brainliest if possible:)

5 0

3 years ago

NEED HELP ASAP ILL MARK BRAINLIEST IF ITS RIGHT!!!

Leto [7]

Answer:

f(1)=-11

f(n)=f(n-1)+22

Step-by-step explanation:

Base equation:

f(n)=-11+22(n-1)

f(1)=-11+22(1-1)

f(1)=-11+0

f(1)=-11

f(n)=-33+22n

f(n-1)=-11+22(n-2)

f(n-1)=-55+22n

-33+22n=-55+22n+x

22n gets canceled out

-33=-55+x

-33+55=x

x=22

f(n)=f(n-1)+22

5 0

3 years ago

to arrive at 2000 liters of 60% saline solution the attendant has to mix a 90% and a 40% saline solution. How many liters of eac

CaHeK987 [17]

Answer:

<u>800 liters</u> of 90% saline solution and <u>1200 liters</u> of 40% saline solution should be used.

Step-by-step explanation:

Given:

At 2000 liters of 60% saline solution the attendant has to mix a 90% and a 40% saline solution.

Now, to find the number of liters of saline solution each should be used.

<u><em>Let the liters of 90% saline solution mix be </em></u> $x.$ <u><em /></u>

<u><em>And let the liters of 40% saline solution mix be</em></u> $y.$

So, the total number of liters:

$x+y=2000.$

$y=2000-x\ \ \ ....(1)$

Now, the total percentage of saline solution:

$90\%\ of\ x+40\%\ of\ y=60\%\ of\ 2000$

$\frac{90}{100}\times x+\frac{40}{100}\times y=\frac{60}{100}\times 2000$

$0.9x+0.4y=1200$

Substituting the value of $y$ from equation (1) we get:

$0.9x+0.4(2000-x)=1200$

$0.9x+800-0.4x=1200$

$0.5x+800=1200$

Subtracting both sides by 800 we get:

$0.5x=400$

Dividing both sides by 0.5 we get:

$x=800.$

<u>The liters of 90% saline solution mix = 800.</u>

Now, substituting the value of $x$ in equation (1) to get the liters of 40% saline solution:

$y=2000-x$

$y=2000-800$

$y=1200.$

<u>Thus, the liters of 40% saline solution = 1200.</u>

Therefore, 800 liters of 90% saline solution and 1200 liters of 40% saline solution should be used.

8 0

3 years ago