The answer is 160 because as you stated in the question the number of bacteria doubles every five minutes, and after 10 minutes there are 40. Therefore, after 15 minutes there are 80 (40 doubled is 80), and after 20 (another 5 minutes), the number of bacteria is the double of 80, which is 160.
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Answer:

Step-by-step explanation:
The number of bushels produced is given by:

The owner's income is given by:

Income is given by the price per unit multiplied by the number of units sold. Therefore, the price function can be represented as:

We can conclude that Collin will have £3691.41 in his account after 10 years.
The original price was $500
First we find 15% of what is $75
15/100 x N =$75
n = $7500/15
n = $500
Answer:
517
Step-by-step explanation:
The radius of a circle is just half of the diameter (1/2d = r)
1034/2 = 517