Aerial photography, satellite imagery, and radar are all examples of
a. gps
b. remote sensing
c. gis
d. weather forecasting

C) GIS. The types of things you mentioned provide series of different information. They don't really help with guidance as a GPS would. Weather forecasting both satellites and radar are used, but not aerial photography. Remote sensing requires the sensor to be high above the ground. That's not required when one uses radar.

Answer is: the volume of propane gas is 4191 liters.
n(C₃H₈) = 76,2 mol.
Vm = 55,0 L/mol.
V(C₃H₈) = ?
V(C₃H₈) = n(C₃H₈) · Vm.
V(C₃H₈) = 76,2 mol · 55 L/mol.
V(C₃H₈) = 4191 L.
n(C₃H₈) - amount of substance of propane gas.