A dolphin jumps out of the water and then back into the water. His
jump could be graphed on a set of axes where x represents time and
y represents distance above or below sea level. The domain for this
graph is best represented using a set of
(1) integers (3) real numbers
(2) positive integers (4) positive real numbers

9514 1404 393

  (4) positive real numbers

Step-by-step explanation:

The x-axis on this graph represents time. We usually are not interested in describing events before the "beginning of time," so time is generally a positive value. The domain is the description of the x-values for which the function is defined. Here, the domain is best represented by ...

  positive real numbers

the formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. if a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this