What is the solution for the equation -2(×-20)=44-×

Mathematics

1 answer:

choli [55]2 years ago

8 0

Answer:

x= -4

Step-by-step explanation:

Using BODMAS, bracket first, multiply all in the bracket with -2, getting the answer, collect like terms and the answer is gotten

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Your class hopes to collect at least 325 cans of food for the annual food drive. There were 132 cans donated the first week and

beks73 [17]

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3 years ago

A survey of 85 families showed that 36 owned at least one DVD player. Find the 99% confidence interval estimate of the true prop

attashe74 [19]

Answer:

$0.424 - 2.58\sqrt{\frac{0.424(1-0.424)}{85}}=0.286$

$0.424 + 2.58\sqrt{\frac{0.424(1-0.424)}{85}}=0.562$

The 99% confidence interval would be given by (0.286;0.562)

Step-by-step explanation:

Information given:

$X= 36$ represent the families owned at least one DVD player

$n= 85$ represent the total number of families

$\hat p=\frac{36}{85}= 0.424$ represent the estimated proportion of families owned at least one DVD player

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 99% of confidence, our significance level would be given by $\alpha=1-0.99=0.01$ and $\alpha/2 =0.05$ . And the critical value would be given by: