I'm sorry no one can answer and where is the question?
Please put in the question and I might be able to help!
Answer:
4.74 hours
Step-by-step explanation:
Given that both person have to place same number of rivets that is
11209
first person take 9 hours to complete the work
hence 1 hour work of 1st person is
of total work
second person takes 10 hours to complete the same work
hence 1 hour work of 2nd person is 
Now if both work together then
1 hour work of both person =
=
thus working together they need
hours = 4.74 hours to complete the whole work which is placing 11209 rivets
The answer is 3 (x+b) (x-2)
Yw! :)
The answer is 20. in simply form but the one that is not simply is 20/1/ There the same.