Your utility company charges 11 cents per kilowatt-hour of electricity. Complete parts (a) and (b) below. A. What is the daily cost of keeping lit a 50-watt light bulb for 12 hours each day?
B. How much will you save in a year if you replace the bulb with an LED bulb that provides the same amount of light using only 20 watts of power?

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.

A25- foot ladder leans against a building and reaches a point of 23.5 feet above the ground .find the angle that the ladder makes with the building