Question

the expression $900 \cdot 2.25^t$ gives the price performance, in bits per second per dollar, of wireless devices from a certain company as a function of years since the company began.\
what does 900 represent in this expression?\
choose 1 answer:\
a the company will have its maximum price efficiency 900 years after it began.\
b the companys initial price efficiency was 900 bits per second per dollar.\
c the price efficiency is multiplied by 900 each year.

Explanation:

This is an exponential function of the form $f(t) = a \cdot b^t$, where $a$ is the initial value when $t=0$ (the start of the time period). Substituting $t=0$ into $900 \cdot 2.25^t$ gives $900 \cdot 2.25^0 = 900 \cdot 1 = 900$, which is the initial price performance when the company began.

Answer:

B. The company's initial price efficiency was 900 bits per second per dollar.