Malik collects rare stamps and has a total of 212 stamps. he has 34 more domestic stamps than foreign stamps. let x represent the number of domestic stamps and let y represent the number of foreign stamps. this system of equations models the given information for both stamp types. x – y = 34 x + y = 212

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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”?