Devise an exponential decay function that fits the given data, then answer the accompanying questions. Be sure to identify the reference point

(t=0)

and units of t.

The pressure of a certain planet's atmosphere at sea level is approximately

1000

millibars and decreases exponentially with elevation. At an elevation of

30,000

ft, the pressure is one-third of the sea-level pressure. At what elevation is the pressure half of the sea-level pressure? At what elevation is it

1%

of the sea-level pressure?

Question content area bottom

Part 1

What is the reference point

(t=0)?

A.

1%

of the sea-level pressure

B.

the elevation,

30,000

ft

C.

the pressure at sea level,

1000

millibars

D.

the elevation at sea level, 0 ft