WILL GIVE BRAINLIEST

Select the equation that is true. • A .2 2/3 × 4 = 8 2/3 • B. 2 2/3 × 5/8 = 1 2/3 • C. 2 2/3 × 2 3 = 2 4/9 • D .2 2 3 × 4 3/5 =

Korvikt [17]

Answer:

b

Step-by-step explanation:

6 0

3 years ago

How would we know the gcf of 4xy+8x^2y-24x^4y^5

Alona [7]

9514 1404 393

Answer:

4xy

Step-by-step explanation:

List the prime factors of each term.

4xy = 2·2·x·y
8x^2y = 2·2·2·x·x·y
24x^4y^5 = 2·2·2·3·x·x·x·x·y·y·y·y·y

Identify a factor that appears in each list. Cross it off of each list and add it to your list of "output" factors. Repeat until you run out of factors that appear in all of the lists.

You should quickly determine that all of the factors of 4xy appear in both other lists. That is the GCF. When you have exhausted the factors of 4xy, there are no more possible common factors.

GCF = 4xy

Then the expression can be factored as ...

= 4xy·(1 +2x -6x^3y^4)

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<em>Additional comment</em>

If you use exponents to simplify writing repeated multiplication, you will find that the GCF has the factors with the lowest exponent. Here, the lowest power of 2 is 2^2 in 4xy; the lowest exponents of x and y are 1, also in that term.

6 0

3 years ago

A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 732 hours. A random sample o

soldi70 [24.7K]

Answer:

$z=\frac{704-732}{\frac{65}{\sqrt{28}}}=-2.279$

$p_v =P(z$

If we compare the p value and the significance level given for example $\alpha=0.05$ we see that $p_v$ so we can conclude that we can reject the null hypothesis, and the the true mean is significantly lower than 732 hours so we have enough evidence to reject the claim

Step-by-step explanation:

Data given and notation

$\bar X=704$ represent the sample mean

$\sigma=65$ represent the standard deviation for the population

$n=28$ sample size

$\mu_o =732$ 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 determine if the true mean is at least 732 or no, the system of hypothesis would be:

Null hypothesis: $\mu \geq 732$

Alternative hypothesis: $\mu < 732$

We know the population deviation, so for this case 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:

$z=\frac{704-732}{\frac{65}{\sqrt{28}}}=-2.279$

Calculate the P-value

Since is a one-side lower test the p value would be:

$p_v =P(z$

Conclusion

If we compare the p value and the significance level given for example $\alpha=0.05$ we see that $p_v$ so we can conclude that we can reject the null hypothesis, and the the true mean is significantly lower than 732 hours so we have enough evidence to reject the claim

5 0

3 years ago

Read 2 more answers

I NEED HELP FAST PLEASEEEE ITS A TEST 15 PTS

Lena [83]

Answer:

a. False

b. z = 8

Step-by-step explanation:

a. Equation answer:2 + 6 = 10 Real answer:2 + 6 = 8

b. 3 + 5 = 8

5 0

3 years ago

The cost to rent a paddleboat at the city park includes an initial fee of $7.00, plus $3.50 per hour. Which equation models the

Olin [163]

Y = 7 + 3.50x

you multiply the number of hours by 3.50$ and add 7$ to that to get total cost

3 0

4 years ago