An incandescent 100W light bulb costs $0.40 and lasts 1200 hours. A compact fluorescent light bulb which outputs the same amount of light uses only 23W, costs $3.65 and lasts 10,000 hours. Compare the cost of buying and using incandescent lights for 10,000 hours versus a compact fluorescent light bulb. Assume electricity costs $0.15 per kWh

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

i'm on my way to history not a mistory.

the answer you are looking for is d. there are no holes for blood to enter or leave the system. your welcome