I An aviator flew 70 miles east from A to C. From C, she flew 100 miles north to B. Find the measure of the angle of the turn (to the nearest degree) that must be made at B to return to A. feet of horizontal.​

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2