Which of the following are examples of exponential decay? select all that apply.

a vehicle depreciates 13% each year.
a tree is doubling in height each year.
an investment earns a 5% interest each year.
air pressure decreases 12% for every 1000 meters in height.
the population of a town is growing at an annual rate of 3.5%.
a retirement account decreases by $12,000 each year.
a radioactive element has a decay rate of 10%.

On the way home from visiting his family, vincent’s plane cruised at an altitude of 3.2 × 10^4 feet. he had heard that a man named felix baumgartner skydived from an altitude of 1.28 × 10^5 feet. vincent wants to know how much higher felix went on his skydiving trip. question 1 you have already seen how adding numbers works in either scientific notation or standard notation. but can you subtract numbers in scientific notation and get the same results as subtracting in standard notation? to find out, first solve vincent’s problem in standard notation. part a write the cruising altitude of vincent’s plane in standard notation.