Type an integer or fraction for x over z + 4y

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

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”?