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just olya [345]
2 years ago
14

Juan wants to earn more than $52 trimming trees. He charges $8 per hour and pays $4 in equipment fees. What are the possible num

bers of hours Juan could trim trees? Use t for the number of hours. Write your answer as an inequality solved for t .​
Mathematics
1 answer:
Komok [63]2 years ago
5 0

Answer:

He has to work for more than 8 hours.

Step-by-step explanation:

8t + 4 > 52

8t + 4 - 4 > 52 - 4

8t > 48

8t/8 > 48/8

t > 8

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Half of each day is taken up by sleeping and eating.

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JulijaS [17]

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4 0
2 years ago
You measure 22 textbooks' weights, and find they have a mean weight of 64 ounces. Assume the population standard deviation is 5.
lara31 [8.8K]

Answer:

Step-by-step explanation:

We want to determine a 90% confidence interval for the true population mean textbook weight.

Number of sample, n = 22

Mean, u = 64 ounces

Standard deviation, s = 5.1 ounces

For a confidence level of 90%, the corresponding z value is 1.645. This is determined from the normal distribution table.

We will apply the formula

Confidence interval

= mean ± z ×standard deviation/√n

It becomes

64 ± 1.645 × 5.1/√22

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Therefore, with 90% confidence interval, the true population mean textbook weight is between 62.21 ounces and 65.79 ounces

3 0
3 years ago
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