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aev [14]
3 years ago
7

Answer the question in the image below

Mathematics
1 answer:
riadik2000 [5.3K]3 years ago
4 0

Answer:

x=1+\sqrt{5} , x=1-\sqrt{5}

Step-by-step explanation:

exchange y for 1:

1=x^2-2x-3

and solve (I used an online calculator - symbolab and mathaway are my favorites).

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Write the sentence as an equation z and 40 more is the same as 344
KengaRu [80]
Your answer z+40=344
3 0
2 years ago
An appliance manufacturer claims to have developed a compact microwave oven that consumes a mean of no more than 250 W. From pre
melamori03 [73]

Answer:

We conclude that a compact microwave oven consumes a mean of more than 250 W.

Step-by-step explanation:

We are given that an appliance manufacturer claims to have developed a compact microwave oven that consumes a mean of no more than 250 W with a population standard deviation of 15 W.

They take a sample of 20 microwave ovens and find that they consume a mean of 257.3 W.

Let \mu = <u><em>mean power consumption for microwave ovens.</em></u>

So, Null Hypothesis, H_0 : \mu \leq 250 W     {means that a compact microwave oven consumes a mean of no more than 250 W}

Alternate Hypothesis, H_A : \mu > 250 W     {means that a compact microwave oven consumes a mean of more than 250 W}

The test statistics that would be used here <u>One-sample z test statistics</u> as we know about the population standard deviation;

                                T.S. =  \frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }  ~ N(0,1)

where, \bar X = sample mean power consumption for ovens = 257.3 W

            σ = population standard deviation = 15 W

            n = sample of microwave ovens = 20

So, <em><u>the test statistics</u></em>  =  \frac{257.3-250}{\frac{15}{\sqrt{20} } }

                                      =  2.176

The value of z test statistics is 2.176.

<u>Now, at 0.05 significance level the z table gives critical value of 1.645 for right-tailed test.</u>

Since our test statistic is more than the critical value of t as 2.176 > 1.645, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which <u>we reject our null hypothesis</u>.

Therefore, we conclude that a compact microwave oven consumes a mean of more than 250 W.

7 0
3 years ago
What is the greatest common factor of x^3 and x?
Lapatulllka [165]
I dont completely know but it might be 3

6 0
3 years ago
Read 2 more answers
How many solutions does -2(t-4)=10-2t
Mekhanik [1.2K]

Answer:

No Solutions

Step-by-step explanation:

Let's find out.

-2(t-4)=10-2t

-2t+8=10-2t

-2t=2-2t

0=2

Hope this helps :)

5 0
2 years ago
Evaluate the expression for<br> a = 11, b = 28. c = 25, d = 10:<br> a + b - C-d
Soloha48 [4]

Answer:

4

Step-by-step explanation:

11 + 28 - 25 - 10

39 - 25 - 10

14 - 10

4

Remember PEMDAS (Parentheses, Exponents, Multiply, Divide, Add, Subtract)

4 0
3 years ago
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