A vertical sag parabolic curve connects a -6% grade to a +1% that meets at station 12+720 with an elevation of 63m. The change in grade is 0.7% every 20m. What is the stationing and elevation of the lowest point of the curve? Group of answer choices 12+791.43; Elevation 63.86m 11+852.72; Elevation 64.27m 13+003.24; Elevation 65.63m 14+283.32; Elevation 66.26m

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Alloys

An alloy is an admixture of two or more metals or a metal and a non-metal. Since ancient times, man has been using alloys. Alloying helps to retain the properties of the parent matter, such as hardness, strength, toughness, ductility and is corrosion-resistant. Copper alloys such as brass have antimicrobial properties that help to fight against (Coronavirus disease 2019) COVID-19 and other hospital-acquired infections. Some common alloys are brass, bronze, solder steel, etc. Most alloys have a lower melting point than their constituents. This is due to the presence of a nonmetal as one of the constituents that behaves as an impurity and restricts the raise of melting point.