Agas company has the following rate schedule for natural gas usage in single-family residences:

monthly service charge $8.80

per therm service charge
1st 25 therms $0.6686/therm
over 25 therms $0.85870/therm

what is the charge for using 25 therms in one month?
what is the charge for using 45 therms in one month?
construct a function that gives the monthly charge c for x therms of gas.

Which term best describes the form sound takes as it travels away from a drum (a- gas)(b-music) ( c-waves) (d-particles

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

What is the mass of sodium in 3 moles of sodium chloride