The model for diminishing marginal utility is parabolic in nature, so it has a a: constant, b: maximum, or c: minimum value?

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

Idon't really understand this can you me and show your work.☺☺[ chemistry b] subject [ electron transfer in lonic bonds]grade( 12)

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?