The mass of a bacteria culture doubles every four days. If the initial sample is 5mg: a) how much will you have after one week (7 days). B) how long does it take to reach a mass of 320mg?

a) 16.82 mg

b) 24 days

Step-by-step explanation:

Formula for exponential growth is given as:

Where A is the final population

is the initial population

b is the growth factor

c is the time taken for the growth 'b'

t is the amount of time

Here, We are given the following:

= 5 mg

b = 2 (Given because it doubles)

c = 4 days

a) A = ?

Using the formula:

b) Given

A = 320 mg

t = ?

Using the above formula again:

So, the answers are:

a) 16.82 mg

b) 24 days

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.

y = 3x+4

step-by-step explanation:

to find the slope

slope = (y2-y1)/ (x2-x1)

    = (-8-4)/ (-4-0)

    = -12/-4

  = 3

using the slope intercept form of a line

y= mx+b

we know the slope is 3

we know the y intercept is 4 ( the point where it crosses the y axis or x=0)

y = 3x+4