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GenaCL600 [577]
3 years ago
6

Help plssssssssssssssssssss

Mathematics
2 answers:
Elina [12.6K]3 years ago
4 0

answer- 18

explanation- 40% of 120= 48 and 25% of 120= 30.

hope this helps !

Semenov [28]3 years ago
3 0
First we need to calculate 25% of 120. If 120=100% and X=25% then 120•25=100•X
3000=100X
X=30. Now we know that 25% of 120 is 30.
Now we need to calculate 40% of 120. If 120=100% and y=40%, then 120•40=100y
4800=100y
y=48. Now we know that 40% of 120 is 48.
To find out how many more questions had Riley finished then Annabel, we need to subtract 48 with 30
48-30=18
FINAL ANSWER—18

Hope this helped❤️
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Answer:

R = P(R_1) P(R_2|R_1) P(R_3|R_2)*....*P(R_n |R_1,..., R_{n-1}

For this case the reliability of the sytem would be given by:

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And replacing we got:

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Step-by-step explanation:

We can assume that the system work in series

If we have in general n units the reliability of the system is the probability that unit 1 succeeds and unit 2 succeeds and all of the other units in the system succeed. fror n units must succeed for the system to succeed. The reliability of the system is then given by:

R = P(R_1) P(R_2|R_1) P(R_3|R_2)*....*P(R_n |R_1,..., R_{n-1}

For this case the reliability of the sytem would be given by:

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And replacing we got:

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