Refer to my last question to answer this one The first screenshot is answered. The second one is not.

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”?