Algebra 1: Common Core (15th Edition)

A)You have p(x)=50 $\times$ $2^{x}$. 2 hours has 4 (30 minute periods) so plug in x=4 to find out the number of bacteria after 2 hours: p(4)=50 $\times$ $2^{4}$ p(4)=50 $\times$ 16 p(4)=800 800 bacteria after 2 hours. -----B)You have p(x)=50 $\times$ $2^{x}$. 24 hours has 48 (30 minute periods) so plug in x=48 to find out the number of bacteria after 1 day: p(48)=50 $\times$ $2^{48}$ p(48)=100 $\times$ $2^{47}$ After 1 day, there would be 100 $\times$ $2^{47}$ bacteria.