Maths

Question 1

How do you work out the order of magnitude?

Answer 1

divide one by the other

x10^X

^X is the order of magnitude

Question 2

What is the equation for the volume and surface area of a sphere?

Answer 2

• volume
  
  • 4/3 𝜋𝑟³
• surface area
  
  • 4𝜋𝑟²

Question 3

How do you work out percentage change?

Answer 3

change / original x 100

Question 4

How do you work out number of bacteria in original sample~?

Answer 4

• take sample from original plate of known volume to make a streak
• incubate overnight
• count colonies formed
• times the number of colonies by the volume of original sample
• n = cv - n / v = c , number of colonies over volume = conc
• conc x original volume = original number of colonies.

Question 5

Bacteria replicate exponentially, how do you work out the number in n generations

Answer 5

• N = N₀ x 2ⁿ
• times by 2 because each doubles