PLEASE HELP I BEG U Determine if the following graph is a function or not.

Which of the following graphs represents the function f(x) = 2^x

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

17 in long 1.3 ft wide and 8in high what is the volume