Help, please I have a math test right now
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Mathematics, 21.06.2019 16:00
The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?
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Mathematics, 21.06.2019 21:50
Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?
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Mathematics, 21.06.2019 23:00
If mary had 320 toy cars and she gave her friend 50 cars and then she gave her brother 72 more cars how much toy cars would mary have left ● explain with proper details
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