A number is perfect if it is equal to the sum of its positive divisors, other than itself. For example, 6 is perfect, because 6 D 1 C 2 C 3. Similarly, 28 is perfect, because 28 D 1 C 2 C 4 C 7 C 14. Explain why 2k1.2k 1/ is perfect when 2k 1 is prime.

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.

step-by-step explanation:

circumference divided by 3.141592654 then timesthe radius twice

step-by-step explanation:

x= 3^y

step-by-step explanation: