2ft 3in + 5ft 11in what is the answer

What is the neutralization reaction

The first supersonic flight was in 1947. it was just above the speed of sound. which altitude would you expect captain yeager to have used for his flight

How can a scientist assess whether a pure niobium (nb) sample is responsible for contaminating the lab with radioactivity? test the niobium sample to see whether it now contains other elements.test the niobium sample for the presence of niobium oxide compounds.heat the niobium, and see if the level of radioactivity in the lab increases.place the niobium under pressure, and see if the level of radioactivity in the lab increases.