Topography maps are best used for which activities? Check all that apply.

designing roads for a new town
locating different mountain peaks
sailing across one of the Great Lakes
estimating the number of trees in an area
determining the best area to build a store

i'm assuming that the correct answer is indeed the first one/ "a"..

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

elements make up everything, and they combine to make compounds.

the answer is c