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11111nata11111 [884]
3 years ago
5

Pls answer this i need help

Mathematics
1 answer:
FinnZ [79.3K]3 years ago
6 0

Answer: D 4n-15=41 and n=14 hazardous waste sites

Step-by-step explanation:

15 less then four times is

4n-15=41

4n-15+15=41+15

4n=56

4n/4=56/4

n=14

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2,309.2

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2 years ago
The figure below shows two half-circles at the ends of a rectangle with the dimension shown.
timurjin [86]

Answer:

D. 154

Step-by-step explanation:

The area of the rectangle is 15*5= 75 inches

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5 0
2 years ago
A large manufacturing plant uses lightbulbs with lifetimes that are normally distributed with a mean of 1200 hours and a standar
a_sh-v [17]

Answer:

The bulbs should be replaced each 1060.5 days.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 1200, \sigma = 60

How often should the bulbs be replaced so that no more than 1% burn out between replacement periods?

This is the first percentile, that is, the value of X when Z has a pvalue of 0.01. So X when Z = -2.325.

Z = \frac{X - \mu}{\sigma}

-2.325 = \frac{X - 1200}{60}

X - 1200 = -2.325*60

X = 1060.5

The bulbs should be replaced each 1060.5 days.

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2 years ago
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nlexa [21]
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Which best describes the circumcenter of a triangle ?
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D. The point where the perpendicular bisectors of the three sides of the triangle intersect.
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3 years ago
Read 2 more answers
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