1 and 2 I’ll give u 45 points

Which metal exist in liquid state and can be cut with knife ?

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?

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?