It D because I hade this too so it is D
Answer: you may be connected to wifi near you
Explanation:
1. Restart your computer
2 Then got to settings
3 Go to Wi-Fi
4. Disconnect from your Wi-Fi
5 Connect to your Wi-Fi
If that does not work, go look it up lol.
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.