Insert parenthesis in the expression: 5+4*2+6-2*2-1 so that it has a value of 19

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)

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?

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.