Answer:
R2 = 43.03 ohms
Step-by-step explanation:
If R2=R4-15, then R4 = R2+15
According to the Wheastone bridge equation we have:
6 Hours
17,100 - 6,300= 10,800
10,800/1,800 = 6
11 hours babysitting
7 hours music lesson
(11*5) + (7*12) = 139