To find how many hours Sonia work on her science project,we can multiply the working hours of Tony by the times Sonia did:

Therefore Sonia work on her science project for 5 5/6 hours.
Hope it helps!
Answer:
Step-by-step explanation:
I'm not quite sure what you mean.... do you mean 8/74? If so, the answer would be 4/37, because anything lower that that would have a decimal.
Answer:
Angle BCD is 13 degrees
Step-by-step explanation:
Here, we want to find the measure of angle BCD
To get this, we need an appropriate diagram. The diagram can be seen in the attachment.
To find the value of BCD, we can use an important triangle theorem.
This is that the sum of opposite interior angles of a triangle equals the exterior angle.
Thus, we have that;
BCD + DBC = CDE
hence;
3x + 5 + 2x + 3 = 9x-12
5x + 8 = 9x -12
9x-5x = 8 + 12
4x = 20
x = 20/4
x = 5
So the measure of BCD will be 2(5) + 3 = 10 + 3 = 13
10. 15.00
11.C
13.C
for 10 just add all the numbers together for each person like 3.00 4 time because there is 4 people and then 1.50 2 time because there are 2 people.