17
E. Coli is a type of bacteria that can cause dangerous health problems. It
doubles every 20 minutes.
Write an expression that can help you determine the number of bacteria
after t minutes.
b) Use your expression to determine the number of bacteria after
i) 5 hours
ii) 8 hours

Step-by-step explanation:

Expression: X = Bacteria  T = Minutes    20t = X

20(15) = X

20(24) = X

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

1. d.90

2. e. none of these (80)

3. a. 0

4. b. 6

5. e. none of these (10)

6. a. 5