Let r+ denote the set of positive real numbers. let f : r × r+ → r be given by f(x, y) = x/y.
(a) is f an injective function? prove your answer.
(b) is f a surjective function? again, prove your answer.
(c) is f a bijection? prove your answer

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

Aline has a slope of and a y-intercept of –2. what is the x-intercept of the line?

This is so hard and it’s for a test