Life Science Application : The major components of human blood are red blood cells, white blood cells, platelets and plasma. A typical red blood cell has a diameter of approximately 7 × 10^–6 metres. A typical platelet has a diameter of approximately 2.33 × 10^–6 metre. Which has a greater diameter, a red blood cell or a platelet?

Life Science : Bacteria can divide in every 20 minutes. So 1 bacterium can multiply to 2 in 20 minutes. 4 in 40 minutes, and so on. How many bacteria will there be in 6 hours? Write your answer using exponents, and then evaluate.

Blubber makes up 27 per cent of a blue whale’s body weight. Deepak found the average weight of blue whales and used it to calculate the average weight of their blubber. He wrote the amount as 2² × 3² × 5 × 17 kg. Evaluate this amount.

A googol is the number 1 followed by 100 zeroes.

(a) How is a googol written as a power?

(b) How is a googol times a googol written as a power?

What’s the error?

A student said that is the same as what mistake has the student made?