Which of the following equations would have to be the second equation so that the system has no solutions? A. y = -x
B. 9y = 6x
C. y = x - 4
D. 6x - 4y = 6

If the measure of angle 1 is 110 degrees and the measure of angle 3 is (2 x+10 degree), what is the value of x?

Use sigma notation to represent the following series for 9 terms.

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”?