The relationship between the elapsed time t, in years, since Rosario started studying the population, and the number of penguins, P(t), is modeled by the following function:
4
t
3
P(t)
21,000
Complete the following sentence about the rate of change in the penguin population.
3
The population of penguins loses of its size every
7
years.
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3x + 4y -25 =0 represents the amount of change sianna should recieve

change of stock price/initial stock price on friday * total stock value = change of stock value

0.89/73.73 *x = 42.72

x=3539.04 = total stock value at initial stock price on friday .

total stock value at initial stock price on friday/ initial stock price on friday = number of shares

3539.04/73.73 = 48 shares

they own 48 shares of this stock