I do not understand theses... Please help!

Mathematics

2 answers:

oee [108]3 years ago

5 0

Y = x + 1
y = 2x - 1

basically we r going to sub in one y for another
x + 1 = 2x - 1
1 + 1 = 2x - x
2 = x

now we sub 2 in for x in either of the original equations to find y
y = x + 1
y = 2 + 1
y = 3

so ur solution is (2,3)

Klio2033 [76]3 years ago

5 0

Y =x+1
y=2x-1
-------------subtract
0 = -x +2

-x + 2 = 0
x =2

y =x+1
y =2+1
y= 3

answer
solution (2,3)

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Suppose a sample of 80 with a sample proportion of 0.58 is taken from a

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Answer:

99.7% confidence interval is $[0.4162,0.7437]$

Step-by-step explanation:

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We are given a sample size of $n=80$ and a sample proportion of $\hat{p}=0.58$ . Our critical score for a 99.7% confidence level would be $z^*=normalcdf(0.9985,0,1)=2.9677$

Therefore, the approximate 99.7% confidence interval for the population parameter is $CI=\hat{p}\pm z^*\sqrt{\frac{\hat{p}(1-\hat{p})}{n} }=0.58\pm 2.9677\sqrt{\frac{0.58(1-0.58)}{80} }=[0.4162,0.7438]$