I really dont understand using these as their inverse can someone help me?​

Me find the measure to side c and the process to solve the problem you appreciate it : )

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

Aline is perpendicular to another line m2= (-1/m1), where m1 is the slope of the original line and m2 is the slope of the perpendicular line. which of the following equations represents the line that passes through the point (-2,1) and is perpendicular to the line below?