Answer:
a. Domain: all real numbers. Range: All real numbers
b. Domain: all real numbers. Range: [0, ∞)
Step-by-step explanation:
In a, we have the function y = x. The domain is all the numbers for which the function exists. In this case, x can by any real number. The range are all the values that the function takes. Since this function takes any real number and give the same number, the range are all real number.s
In b. we have y = |x|. Once again, any real number can be the input of the function. The function takes any number and apply the modulo operation, which give us the distance to zero, or the possitive value. Then the range are all the non-negative numbers, because if a negative number is input of the function, the output is always positive or 0.