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Zina [86]
2 years ago
14

Simplify this 13.) 13y² + 9y + 4y² - 31y

Mathematics
1 answer:
erastova [34]2 years ago
3 0

Answer: 17y^2-22y

Step-by-step explanation:

13y^2+9y+4y^2-31y

\mathrm{Group\:like\:terms}

=13y^2+4y^2+9y-31y

\mathrm{Add\:similar\:elements:}\:13y^2+4y^2=17y^2

=17y^2+9y-31y

\mathrm{Add\:similar\:elements:}\:9y-31y=-22y

=17y^2-22y

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3 years ago
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Answer:

2.87%

Step-by-step explanation:

We have the following information:

mean (m) = 200

standard deviation (sd) = 50

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P (x> 21.5) = P [(x - m) / (sd / n ^ (1/2))> (21.5 - 200) / (50/40 ^ (1/2))]

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P (x> 215) = P (z> 1.897)

P (x> 215) = 1 - P (z <1.897)

We look for this value in the attached table of z and we have to:

P (x> 215) = 1 - 0.9713 (attached table)

P (x> 215) =.0287

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