Hannah’s after-school job is tutoring math. The profit she earns is modeled by the function P(x) = 20x, where x is the number of hours, to the nearest whole hour, she tutors. What is an appropriate domain for the function? A.

all negative integers

B.

all integers

C.

all positive integers

D.

all real numbers

options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.