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motikmotik
3 years ago
15

Enter the x-coordinate of the solution to this system of equations.

Mathematics
1 answer:
mart [117]3 years ago
7 0

Answer:

i think photomath can help with the question I'ma check

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Rob and his two friends were digging holes to plant some new trees. The holes need to be at least 3 feet deep. So far robs hole
Greeley [361]

Rewrite all the numbers as decimals:

14/5 = 2.8

2.6 is already a decimal

2 1/8 = 2.125

2.8 is the largest number so rob is closest to being finished.

7 0
3 years ago
The life of light bulbs is distributed normally. The standard deviation of the lifetime is 15 hours and the mean lifetime of a b
Anastaziya [24]

Answer:

0.8413 = 84.13% probability of a bulb lasting for at most 605 hours.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score 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 p-value, we get the probability that the value of the measure is greater than X.

The standard deviation of the lifetime is 15 hours and the mean lifetime of a bulb is 590 hours.

This means that \sigma = 15, \mu = 590

Find the probability of a bulb lasting for at most 605 hours.

This is the pvalue of Z when X = 605. So

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

Z = \frac{605 - 590}{15}

Z = 1

Z = 1 has a pvalue of 0.8413

0.8413 = 84.13% probability of a bulb lasting for at most 605 hours.

7 0
3 years ago
A drill can dig through rock at a rate of 2 1/2 inches per hour. How many hours will it take for the drill to reach five feet be
Gre4nikov [31]
5 feet is equal to 60 inches. 60 inches divided by 2.5 inches per hour means it would take 24 hours for the drill to reach five feet (assuming it maintains the same rate of digging)
7 0
3 years ago
Read 2 more answers
A sales associate in a department store earns a commission on each suit and each pair of shoes sold. One week, she earned $47 in
earnstyle [38]
3s + h = $47
7s + 2h= $107


3s + h =$47
3s - 3s + h = $47 -3s
h = $47 - 3s

7s + 2($47 - 3s) = $107
7s + 94 -6s = 107
s + 94 = 107
s +94 -94 = 107- 94
s = 13

3(13) + h = $47
39 + h =$47
39 -39 + h= $47-39
h = 8

Check
7s + 2h= $107
7(13) + 2(8)= $107
91 + 16= 107
107 = 107

She earns $13 per suit sold and $8 per pair of shoes sold.



5 0
3 years ago
Please help me do this problem.
Aleksandr-060686 [28]

Sorry...

Dmdidndjdkdbxidkjddkdnhd

4,10,44 and 19 :)

6 0
2 years ago
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