Anyone know how to do this

Which value of c would make he following expression completely factored? 8x+cy

Solve with work both bert and ernie received an increase in their weekly salaries. bert's salary increased from $520 to $520. ernie's salary went from $580 to $645. find the percent of increase for each salary. what was the larger of the two percents ?

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles