Question

do i cross cancel using division?

Answer 1

here is the problem: Scientists can estimate the amount of bacteria in a refrigerated food by using the formula 0.2b=T^2/20 where b is the number of bacteria and t is the number of seconds. What is the approximate time a food was in the refrigerator if there are 625 bacteria?

Answer 2

\(0.2 \times 625 = T^2/ 20 \\ \implies T^2 = 0.2 \times 625 \times 20 = ....\)

Answer 3

so in which step you had that doubt?

Answer 4

i did everthing right except setting up the problem

Answer 5

so we just plug in b = 625 in the given formula
and multiply both sides by 20

Answer 6

to eliminate the fraction (division by 20) on right

Answer 7

i got everything except the divide by 20 part

Answer 8

so is this right : in seconds the answer is 2,500 and in minutes the answer is 41.6