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3 years ago

I don’t get how to solve it plz help!!

Mathematics

1 answer:

Shtirlitz [24]3 years ago

4 0

This function is consist of two subfunction with different domains.

f(-1) means x= -1 ≤ 1 and we will use subfunction -x+2 => f(-1)=-(-1)+2= 1=2=3

f(3) means x=3 > 1 and we will use subfunction x∧2-4x+6 =>

f(3)= 3∧2-4*3+6= 9-12+6=3

Good luck!!!

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4 years ago

What is equivalent to 3(a+4)-5(a-2)=22

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Answer:

a = 0

Step-by-step explanation:

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3 years ago

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I need help and this is giving out 10 points.

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What should a size of a sample be in order to have a margin of error of 4% for a 90% confidence level from a population with a s

vagabundo [1.1K]

Answer:

We need a sample size of 2,071,800 or higher.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

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Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

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$M = z*\frac{\sigma}{\sqrt{n}}$

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In this problem:

We need a sample size of n or higher, when $M = 0.04, \sigma = 35$ . So

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$0.04 = 1.645*\frac{35}{\sqrt{n}}$

$0.04\sqrt{n} = 1.645*35$

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