Multiply each hourly rate by x ( time to complete the work) add it to the service call for each and then set the equations equal:
50 + 40x = 30 +45x
Subtract 30 from both sides:
20 + 40x = 45x
Subtract 40x from both sides:
20 = 5x
Divide both sides by 5
x = 4
The length is 4 hours.
Answer:20cm
Step-by-step explanation:
If the blue ribbon is 9cm shorter you’re just subtracting 29-9 which is 20cm.
Bases+faces=surface area
15.6+81=96.6
Because 1/2*6*9=27*3=81