starfox5454
19.06.2020 •
Mathematics
Solve the equation x + 7 = 12
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Ответ:
x=5
Step-by-step explanation:
x+7=12
If you do the same thing to both sides of the equation, then the trueness of the equation does not change. Therefore, I can subtract 7 from both sides of the equation to isolate x.
x+7-7=12-7
x=5
Hope this helps!
Ответ:
Using proportions, it is found that the marginal distribution is:
90% of the flights were on time.10% of the flights were delayed.---------------------------
In total, there were 170 + 120 + 55 + 20 = 365 flights.Of those, 167 + 115 + 40 + 8 = 330 on time. The percentage on time is:
90% on time, and the rest, that is, 100% - 90% = 10% were delayed, and the marginal distribution is described by these percentages.A similar problem is given at link