Which angles of the triangles measure 90°?

Amarathon runner jogging at a constant speed for 45 minutes is it proportional to time or not

Which is the focus of a parabola with equation y2=4x

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?