Air Pressure decreases exponentially with increases in elevation. The air pressure y,(in atm units) at a given elevation, x, (in meters) can be modeled using equation y=e^-kx, where k is the decay constant. At an elevation of 5486 m where the air pressure is 0.5 atm, what is the value of k?

Someone answer this asap for gabriella uses the current exchange rate to write the function, h(x), where x is the number of u.s. dollars and h(x) is the number of euros, the european union currency. she checks the rate and finds that h(100) = 7.5. which statement best describes what h(100) = 75 signifies? a. gabriella averages 7.5 u.s. dollars for every 100 euros. b. gabriella averages 100 u.s. dollars for every 25 euros. c. gabriella can exchange 75 u.s. dollars for 100 euros. d. gabriella can exchange 100 u.s. dollars for 75 euros.