Bossvideogamer21
  • Bossvideogamer21
do i cross cancel using division?
Mathematics
chestercat
  • chestercat
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Bossvideogamer21
  • Bossvideogamer21
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?
hartnn
  • hartnn
\(0.2 \times 625 = T^2/ 20 \\ \implies T^2 = 0.2 \times 625 \times 20 = ....\)
hartnn
  • hartnn
so in which step you had that doubt?

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Bossvideogamer21
  • Bossvideogamer21
i did everthing right except setting up the problem
hartnn
  • hartnn
so we just plug in b = 625 in the given formula and multiply both sides by 20
hartnn
  • hartnn
to eliminate the fraction (division by 20) on right
Bossvideogamer21
  • Bossvideogamer21
i got everything except the divide by 20 part
Bossvideogamer21
  • Bossvideogamer21
so is this right : in seconds the answer is 2,500 and in minutes the answer is 41.6
hartnn
  • hartnn
|dw:1442702290157:dw|
hartnn
  • hartnn
T^2 is 2500 so T = 50 seconds :)

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