Which function’s domain consists of only real numbers greater than 3?

the answer is

f(x)=1/√(x-3)

Step-by-step explanation:

we know that

case a) f(x)=3x

the domain is all real numbers> interval (-∞,∞)

case b) f(x)=√x

the domain is all real numbers greater or equal than 0

the interval [0,∞)

case c) f(x)=3x+4

the domain is all real numbers> interval (-∞,∞)

case d) f(x)=1/√(x-3)

the denominator can not be zero and can not be negative

so

 (x-3) > 0> x > 3> the domain is  all real numbers greater than 3

the interval is (3,∞)

the answer is

f(x)=1/√(x-3)

step-by-step explanation:

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.