A already assigned variable cannot be assigned twice You can make the variable change over to a new one or call a whole new one to assign one without a value or It might be possible to do v=n (v is variable and n is number / value)
Answer:
a) 
b) 
c) 10000 programs.
Explanation:
a) We know that the frequency is the inverse of the period, so:

1μs is equal to 
so 
b) If in a second there are 2.5*10^9 cycles:

c) we have to make a conversion, we know that a program takes 100*10^(-3) milliseconds, that is, 1*10^(-4) seconds so in 1 second we can execute:

10000 programs.
Answer:
b. The Upcoming Lunch & Learn Program Is in March.
Explanation:
A subject line identifies the e-mail intent. The subject line displayed the user or recipient when they look at the list of messages.
For informational e-mail, some points take into consideration.
- Write a subject line
- keep it short
- place important words
- eliminate filler words
- clear and specify the topic
- keep the subject line simple
- Set a deadline in the subject line
- Highlight the value that offered
I think option b is suitable for the informational subject line in an e-mail.