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# The plywood that adam cut has an area of rectangle that is 9x^4 + 24x^2 + 7x - 3. what is the width of the plywood if it’s length is x+4? .

• Réponse publiée par: christiandumanon

so 1 peson = 40 hours

now for the moment of truth

the answer is 3. repeating hours

but we can still solve it cuz we are talking bout' time

so if 40/12 is 3 and three is the remainder

and the closest multiple is 48

48-40=8

8 of 12 is 66.

or 2/3 of 100

so 2/3 in minutes is 40

so the answer is 3 hours and 40 minutes

• Réponse publiée par: nelspas422

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Confidence interval for the population mean
z-test or normal distribution
solution:
given:
n=20, x̄ =89, s=2.0, 99%
formula:
x̄ -z_alpha/2(s/square root of n)< µ< x̄ +z_alpha/2(s/square root of n)
89-(2.575)(2.0/square root of 20)< µ< 89-(2.575)(2.0/square root of 20)
87.848< µ< 90.152

margin of error:
solution:
the critical value is 2.575.
the standard deviation is 2.0 (from the question), but as this is a sample, we need the standard error for the mean.
the formula for the se of the mean is  standard deviation / √(sample size), so: 2.0/ √(20)=0.447.
me=2.575 * 0.447 = 1.151.

therefore, the margin of error is 1.151  with the confidence interval of 87.848< µ< 90.152.
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The plywood that adam cut has an area of rectangle that is 9x^4 + 24x^2 + 7x - 3. what is the width...