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21.04.2020 •
Mathematics
3. A number from 1 to 10 is chosen at random. What is the probability of choosing a 4 or an odd number?
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Ответ:
60%
Step-by-step explanation:
There are 5 odd numbers between 1 and 10. Therefore, the ratio of odd numbers to all whole numbers between 1 and 10 is 5:10. However, the problem also mentions 4. Since 4 is one whole number, we can add it to the left side of the ratio. The ratio of odd numbers or 4 to all whole numbers between 1 and 10 is 6:10. To convert to a percentage, multiply each side by 10. We get 60:100, or 60 out of 100, which is written as 60%. Therefore, the probability of choosing a 4 or an odd number is 60%.
Ответ:
D. x = 4.
Step-by-step explanation:
As the 2 angles are congruent:
2.3x +25 = 5.8x + 11
2.3x - 5.8x = 11 - 25
-3.5x = -14
x = 14/3.5
x = 4.