0.006 is 1/10 of 0.06 .
Correct me if I am wrong.
Answer:
It will take them 3.43 hours.
Step-by-step explanation:
Let T denote the total cookies that need to be cocked. Observe that:
- If Rosanne finishes the cookies in 6 hours, that means that she can make
cookies per hour. - If Dorothy finishes the cookies in 8 hours, that means that she can make
cookies per hour.
Then, by 1) and 2), if they work together would we able to make

cookies per hour.
Therefore, in order to finish the T cookies they will need 
1700 and 2550
You might want to double check that. I'm not certain.
b is a diagonal of a square. Diagonal is just
which means that b is equal to
.