Symbols on the periodic table are short abbreviations for elements, often using letters from the element’s name or its Latin name. For sodium, the symbol is Na, with an uppercase N and a lowercase a. This comes from natrium, the Latin name for sodium, which is why the symbol isn’t a direct match to the English word “sodium.” You’ll also see S representing sulfur, Nd representing neodymium, and “So” isn’t used because no element has that symbol. So, Na is the correct symbol because it follows the standard convention and reflects the Latin origin of the element’s name.

Safety improvements from a new bike lane are best reflected by a reduction in crashes and injuries involving cyclists, along with evidence of safer interactions between cyclists and motor vehicles. This directly measures whether the lane is actually making riding safer, not just changing how people travel. Travel-time shifts for motorists don’t capture safety outcomes, and rider numbers alone show usage rather than risk. If crash data don’t show a change, that doesn’t necessarily mean safety hasn’t improved—it could indicate the need for more time to collect data or that the data don’t fully capture risk reductions (for example, if near-misses or minor incidents aren’t recorded). A robust assessment often blends crash data with exposure context (how many cyclists and how much riding occurs) and looks at injury severity to gauge true safety impact.

Think about the chance that at least one of A or B occurs. For any two events, P(A or B) = P(A) + P(B) − P(A and B). Since A and B are independent, the probability both occur is P(A and B) = P(A)P(B) = 0.6 × 0.5 = 0.3. Plugging in gives P(A or B) = 0.6 + 0.5 − 0.3 = 0.8. So the probability that at least one of A or B happens is 0.8. This uses the idea that you add the probabilities of each event but subtract the overlap because it’s counted twice, and for independent events that overlap equals the product.

The main concept being tested is the government's power to take private property for public use. This power is called eminent domain, which allows the state or a government agency to acquire private land for projects like roads, schools, or utilities, while requiring that the owner receive just compensation at fair market value. In most legal systems, including the United States, this protects the public need while ensuring landowners aren’t left uncompensated. Other terms don’t fit: confiscation implies taking without compensation, which is not the standard practice today; sequestration refers to legally seizing or freezing assets in a dispute, not the general power to take property for public use; and limiting resources isn’t a recognized term for this concept. Therefore, eminent domain is the correct term.