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3 years ago

Which expression is eqivalent to 9a +12

Mathematics

2 answers:

koban [17]3 years ago

8 0

$3(3a + 4)$

this the anwers

solong [7]3 years ago

4 0

Answer:

An easy way to do it,is just multiply both terms by a number 2 (9a+12)=18a+24 it doesn't have to be 2, it can be any number

Hope this Helps:)

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Black_prince [1.1K]

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The test statistic value Z = 4.64 > 1.96 at 0.05 level of significance

Null hypothesis is rejected

Alternative hypothesis is accepted

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Step(i):-

Given sample size 'n' = 167

Given data In a sample of 167 children selected randomly from one town, it is found that 37 of them suffer from asthma.

Sample proportion

$p^{-} = \frac{x}{n} = \frac{37}{167} = 0.2215$

Given Population proportion 'P' = 11% = 0.11

Step(ii) :-

Null Hypothesis : H₀ : p = 11

Alternative Hypothesis H₁: p≠11

Test statistic

$Z = \frac{p^{-} -P }{\sqrt{\frac{P Q}{n} } }$

$Z = \frac{0.2215 -0.11 }{\sqrt{\frac{0.11 X 0.89}{167} } }$

Z = 4.64

step(iii)

Critical value Z = 1.96

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Null hypothesis is rejected

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