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4 years ago

3+12x5/(5+15) What’s the answer

Mathematics

2 answers:

monitta4 years ago

5 0

I think the answer is 6. I’m not sure tho ;-;

r-ruslan [8.4K]4 years ago

3 0

$\bf 3+12\times \cfrac{5}{(5+15)}\implies 3+12\times \cfrac{5}{\underset{\uparrow }{20}}\implies 3+12\times \cfrac{1}{4}\implies 3+\cfrac{\stackrel{\downarrow }{12\times 1}}{4} \\\\\\ 3+\cfrac{12}{4}\implies 3+\stackrel{\downarrow }{3}\implies 9$

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Answer:

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Step-by-step explanation:

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4 years ago

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Shkiper50 [21]

Answer:

$z=\frac{750-800}{\frac{350}{\sqrt{100}}}=-1.429$

Step-by-step explanation:

Data given and notation

$\bar X=750$ represent the sample mean

$\sigma=350$ represent the population standard deviation for the sample

$n=100$ sample size

$\mu_o =800$ represent the value that we want to test

$\alpha$ represent the significance level for the hypothesis test.

t would represent the statistic (variable of interest)

$p_v$ represent the p value for the test (variable of interest)

State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the mean is lower than 800, the system of hypothesis would be:

Null hypothesis: $\mu \geq 800$

Alternative hypothesis: $\mu < 800$

If we analyze the size for the sample is > 30 and we know the population deviation so is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:

$z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}$ (1)

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

Calculate the statistic

We can replace in formula (1) the info given like this:

$z=\frac{750-800}{\frac{350}{\sqrt{100}}}=-1.429$

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4 years ago

What is the value of the expression? −34+(110÷25)

AVprozaik [17]

First, since you are using the order of operations (PEMDAS), you would start in the parenthesis.
<span>-34 + (110 ÷ 25)
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Now, you just add the two numbers.
</span>-34 + 4.4 = -29.6

-34 + (110 ÷ 25) = -29.6

I hope this helps!

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BabaBlast [244]

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Amiraneli [1.4K]

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