20 points
2 answers:
Answer: 
which is choice C
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Explanation:
x = total number of minutes spent using the vacuum
If x is larger than 15, then x-15 represents the amount of time spent past the first 15 minutes. The machine will charge 15 cents per minute at this point. The machine will charge 0.15 dollars for (x-15) minutes. So 0.15*(x-15) dollars is charged on top of the $2 already spent for those first 15 minutes.
In total, the cost for Caroline is
T = 2+0.15(x-15)
This total must not be larger than $7. The total T can be equal to 7 or smaller than 7
So,
============================================================
Explanation:
x = total number of minutes spent using the vacuum
If x is larger than 15, then x-15 represents the amount of time spent past the first 15 minutes. The machine will charge 15 cents per minute at this point. The machine will charge 0.15 dollars for (x-15) minutes. So 0.15*(x-15) dollars is charged on top of the $2 already spent for those first 15 minutes.
In total, the cost for Caroline is
T = 2+0.15(x-15)
This total must not be larger than $7. The total T can be equal to 7 or smaller than 7
So,
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Answer:
25.15 ponds is the weight of two year old baby corresponds to 10th percentile.
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 29 pounds
Standard Deviation, σ = 3 pounds
We are given that the distribution of weight of two year old babies is a bell shaped distribution that is a normal distribution.
Formula:
We have to find the value of x such that the probability is 0.10
P(X < x)
Calculation the value from standard normal z table, we have,
Thus, 25.15 ponds is the weight of two year old baby corresponds to 10th percentile.