Answer:
A display device is the most common form of output device it presents output visually on a computer screen.the output appears temporarily on the screen and can easily altered or erased,it is sometimes referred to as softcopy
Answer:
D. Pedestrians ignoring DON'T WALK signs
Explanation:
Pedestrians ignoring DON'T WALK signs is something you need to keep an eye out for near packed intersections.
D. They provide a platform for collaboration
Answer:
a) Speedup gain is 1.428 times.
b) Speedup gain is 1.81 times.
Explanation:
in order to calculate the speedup again of an application that has a 60 percent parallel component using Anklahls Law is speedup which state that:

Where S is the portion of the application that must be performed serially, and N is the number of processing cores.
(a) For N = 2 processing cores, and a 60%, then S = 40% or 0.4
Thus, the speedup is:

Speedup gain is 1.428 times.
(b) For N = 4 processing cores and a 60%, then S = 40% or 0.4
Thus, the speedup is:

Speedup gain is 1.81 times.