What is the range of the function y=(2x+3) for the domain 3≤x≤9?

Answer 1

Plug in x = 3 and figure out what the corresponding value of y is (2 times 3 plus 3). That is one extreme for the range. Next, plug in x = 9 and figure out what the corresponding value of y is (2 times 9 plus 3). That is the other extreme for the range.