A,added to the beginning of a word, can add to or change its meaning a. appendix b. definition c. prefix d. suffix

You posted this in the wrong subsection, but I'll help you out anyways.

The answer is C. Prefix. Examples of prefixes are co-, de-, and dis-. Examples of words with prefixes are co-pilot, defrost, and disagree. 

The answer is C. Prefix.

Prefix example are un, re, and dis-

Words like reheat, dishonest and unethical use prefixes

No. of Persons= 16

Step-by-step explanation:

There was a one phone line

Average no of people calling = 60 in one hour

% of all callers at most can get busy signal

Probability < 0.6

Probability for less than 1 person on hold = 0.2642

No of persons = 0.2642(60)

= 15.852 or 16

16 persons in hour the company is able to put on hold