Based on your knowledge of energy conservation, which of the following statements is true?
a. manufacturers can increase a light bulb; s energy efficiency by using technology that increases the amount of electromagnetic energy the bulb converts from a given amount of electrical energy.
b. energy can be conserved by turning off lights when they are not in use
c. both a and d
d. neither a nor b

C. both a and b

If a light bulb can last longer with the same amount of energy it is given, that means it can use less energy to do the same job compared to one that does not last longer with the same amount of energy it is given. It is much like how a more fuel efficient car will be able to go farther on the same tank of gas, but if you pair it with a car that doesn't have as great of an mpg, when they go the same distance, the car with the greater mpg spends less fuel.

If you don't have to use the energy when you aren't utilizing it, then you can conserve the energy for when you do need it.

29.1-12=17.1the answer is this one