Using the triple beam balance pictured below, what is the mass of rock? 200
400
30
20
50
60
וחווןווןוחוויון
2
What is the mass of the rock?
355.6 g
3558
350.4g
О
354.6 g

An electric power distributor charges residential customers $0.10 per kilowatt-hour (kwh). the company advertises that "green power" is available in 150 kwh blocks for an additional $4 per month. (green power is generated from solar, wind power, and methane sources.) if a certain customer uses an average of 391 kwh per month and commits to one monthly 150 kwh block of green power, what is her annual power bill