Vector v has a direction of (-4,27) find the direction angle for v
a) 81.6 degrees
b) 98.4 degrees
c)261.6 degrees
d)278.4 degrees

Hurry and answer this! circle x with a radius of 6 units and circle y with a radius of 2 units are shown which steps would prove the circles similar? translate the circles so they share a common center point, and dilate circle y by a scale factor of 4. translate the circles so the center of one circle rests on the edge of the other circle, and dilate circle y by a scale factor of 4. translate the circles so they share a common center point, and dilate circle y by a scale factor of 3. translate the circles so the center of one circle rests on the edge of the other circle, and dilate circle y by a scale factor of 3

We just started the introduction into circles and i have no idea how to do this.

What is the product? a-3/15a × 5/a-3