The equation for a proportional relationship is y=5.8x. What is the constant of proportionality

What is the measure of angle tvu shown in the diagram below

What is the value of x? assume that the line is tangent to the circle.

Which of the following transformations will make coincide with ? a. counter-clockwise rotation 90º about a, followed by a translation 5 units to the right b. translation 5 units to the right, followed by a reflection across the y-axis c. translation 5 units to the right, followed by a reflection across the x-axis d. translation 1 unit up and 5 units to the right, followed by a reflection across the x-axis