Choose the situation which would best be modeled by an exponential decay function.
a) an island is being eroded away and loses 10% of its beachfront every year.
b) a player's batting average decreases by .025 for each year he is in the major leagues.
c) a bank account has fallen below a minimum balance and is being charged $1.50 per day in fees.
eliminate
d) a machine depreciates (loses value) by $1000 in its first year, by $2000 in its second, $3000 in its third, etc.

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

1. find the area of the unshaded square 2. find the area of the large square 3. what is the area of the frame represented by the shaded region show