Let the number of hours she spent in baby- sitting is x
and the number of hours she spent in music lessons is y.
Now, we have been given that she worked a total of 18 hours. Hence, we have
And she made $139. Thus, we have
Substituting the value of y from equation 1 in 2, we get
Therefore, she spent 11 hours in baby-sitting.
And you know right this girl has how many years of the first type of quantity of correspond to one unit of the second type of quantity
Answer:
Step-by-step explanation:
If a watch has fewer than three defects, then either 1.) It has no defects, 2.) it has exactly 1 defect, or 3.) it has exactly 2 defects.
1.) The probability that the watch has no defects is , because for every chime there is a probability of that there is no defect
2.) The probability that the watch has exactly 1 defect is times the number of ways you can choose 1 of 75 of the chimes to be defective, which is , so the probability that the watch has exactly 1 defect is .
3.) For the same reason as 2.), the probability that the watch has exactly two defects is
Since 1.), 2.), and 3.) are mutually exclusive events, the probability of their union is simply the probability of each of them added together, which is