In general, if we have 
then 
Thus, the first answer choice is correct.
R=8+I
S=4R
R+I+S=112
R+R-8+4R=112
6R=120
R=20
So therefore, Ruby worked 20 hours, Svetlana worked 80 hours, and Isaac worked 12 hours.
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Answer:
Q+ (5,-5)
Step-by-step explanation:
If the point is to be moved 5 units down, it means that its 'y' coordinate must be subtracted 5.
Same thing happens with x coordinate, it is moved 5 units to right, it meas that its 'x' coordinate must be summed with 5.
The whole operation can be written as the following addition:
Q + (5,-5)
