What is the slope of a line that is perpendicular to the line y = -1/4 -1

What is the range of the data below? .8090100

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?