luella614ox1zum
13.01.2020 •
Mathematics
One number is four more than a second number. three times the first is 12 less than 2 times the second. find the numbers
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Ответ:
Step-by-step explanation:
Let the number be x
x = 4y(1)
3y = 2x - 12(2)
Putting (1) into (2)
3y = 2(4y) - 12
3y = 8y - 12
3y - 8y = -12
-5y = -12
y = -12/-5
y = 12/5
y = 2 2/5
And x = 4y
Putting y = 12/5
x = 4 × 12/5
x = 48/5
x = 9 3/5
Ответ:
P(1st number less than 8 and 2nd number less than 8) =
P(1st number less than 8)*P(2nd number less than 8) =
(7/12)*(7/12) = about 34%