The solution to 5* 1 will be what kind of number

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Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

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”?