There's a school of thought that roblox is actually highly addicting. how many game hours were logged in 2018 cumulatively?

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

According to the tide table below what time of day will the highest tide occur?