2 years ago

What is equivalent to -3(3y-2x)+2(5x-4y)

2 answers:

4 0

-9y+6x+10x-8y
to expand brackets, you multiply the number outside by the numbers inside. first -3x3= -9.
-2 by -3 is 6
2 by 5 is 10
2 by -4 is -8

melisa1 [442]2 years ago

4 0

-3(3y-2x)+2(5x-4y)
=-9y+6x+10x-8y
=-17y+16x
=16x-17y

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Step-by-step explanation:

We are asked to find the size of sample to be 95% confident that the error in psychologist estimate of mean reaction time will not exceed 0.01 seconds.

We will use following formula to solve our given problem.

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Substitute given values:

$n\geq (\frac{z_{0.025}\cdot\sigma}{E})^2$

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$n\geq 96.04$

Therefore, the sample size must be 97 in order to be 95% confident that the error in his estimate of mean reaction time will not exceed 0.01 seconds.

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Read 2 more answers

XY=7a,YZ=5a,XZ=6a+24

leonid [27]

7a + 5a = 6a + 24
6a = 24 
a = 4 
XZ = 6(4) + 24 
XZ = 48

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