A biologist begins working with a sample containing 20,000 bacteria. the pooukation size doubkes every 10 days according to tge eqyation p(t) = 20,000(2)^t/10 where t represents the number of days. after seven days tge biologist begins working with a second sample of 20,000 bacteria. the equation used to represent the pooukation of sample 2 after t days is p(t) = 20,000(2)^t-7/10 which of the following is an equivalent form of the equation for the population of sample 2?

A: p(t) = 20,000•2^t-7/2^10

B: p(t) = 20,000•2^t/10/2^7

C: p(t) = 20,000•7 root of 2^t/2^10

D: p(t) = 20,000^10 root of 2^t/10 root of 2^7