3 years ago

Need help ASAP ( frist one branly)!!!!

Mathematics

2 answers:

valentina_108 [34]3 years ago

7 0

Which ones do you need help on?

Lena [83]3 years ago

6 0

At least try to work it out and maybe you'll get it.

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Plot the four points on the number line below <br> -1/3 1 2/3 2/3 1 1/3

navik [9.2K]

Answer:

Step-by-step explanation:

6 0

3 years ago

In a clinical trial of a cholesterol drug, 321 subjects were given a placebo, and 7% of them developed headaches. For such ra

artcher [175]

Answer: The value of n is 321.

Step-by-step explanation:

Since we have given that

Sample size = 321

Percentage of them developed headaches = 7%

So, the value of p would be

$\dfrac{x}{n}=\dfrac{7}{100}=0.07$

Now, the value of q would be

$q=1-p\\\\q=1-0.07\\\\q=0.93$

And the mean for the number of subjects who develop headaches would be

$n=pq\\\\n=0.07\times 0.93\\\\n=0.0651$

and the standard deviation would be

$\sigma=\sqrt{npq}\\\\\sigma=\sqrt{321\times 0.07\times 0.93}\\\\\sigma=4.571$

Hence, the value of n is 321.

7 0

3 years ago

Which number is a factor of 15 but not a multiple of three

sashaice [31]

5 would be an answer.<span />

3 0

4 years ago

Read 2 more answers

A is between B and T. if AB=7y+9, AT=3y+4, and BT=143. find AB

Alenkinab [10]

AB+AT=BT
(7Y+9)+(3Y+4)= 143
10Y+13= 143
10Y= 130
Y=13
AB= 7Y+9
AB= 7*13+9
AB=100

5 0

3 years ago

I have three times as much money as does my brother. Our combined total is $42. How much does each of us have?

nika2105 [10]

For an instance, i stands for the money that you have, and b stands for the money that brother has.
An equation system based on the problem would be
i + b = 42 (equation 1)
i = 3b (equation 2)

Use substitution method to solve the problem
substitute 3b into i in the equation 1
i + b = 42
3b + b = 42
4b = 42
b = 42/4
b = 10.5

substitute the value of b into the equation 1
i = 3b
i = 3(10.5)
i = 31.5

You have $31.5 and your brother has $10.5

4 0

3 years ago