What gates and control would need to be added to the 4-bit adder to allow it to operate with two’s complement arithmetic to perform addition or subtraction? What changes will be required at the input and how can you select addition or subtraction as a function? Can you detect overflow of the 4-bit number using a single gate, if so, which gate and which signals?

"gps interaction and cognitive process" respond to the following: imagine that you have been asked to design a gps product that will have voice recognition and bluetooth capability. discuss and conceptualize a user interaction model. predict two (2) problems that may arise in gps products with voice recognition and bluetooth capability. recommend solutions for each of these issues. attention is one of the six cognition processes. when attention is applied to a design, the goal is to make it easier for the end user to quickly locate where he / she should type information on the computer or mobile device screen. compare and contrast how the google search engine and the microsoft bing search engine employ the attention cognition process. provide your opinion as to which search engine better employs the attention cognition process and explain why.