Item 17 there were nn signers of the declaration of independence. the oldest was benjamin franklin, who was yy years old. 7 is 10% of yy and nn is 80% of yy. how many signers were there?

7 is 10% of yy then we get the equation :
0.1*yy=7 so yy=7/0.1=70.
also, 
nn=0.8*yy.
 so nn=0.8*70=56. 
There were 56 signers then. 

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.