- A
- B
- C
- D
Step-by-Step Solution
9 hours = three steps of 3 hours, so multiply by 10 three times: .
Answer: C)
A bacteria colony doubles each hour, but a scientist models its size as roughly multiplying by 10 every 3 hours.
If it starts at cells, about how many cells after 9 hours using this 'times 10 per 3 hours' model?
Class 7Powers of 10Number System
Master this chapter in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Powers of 10 practice questions
More Class 7 Powers of 10 practice
A shopkeeper in Pune stacks rice bags so that each higher shelf holds 10 times as many…Sneha compares two numbers: A = 6 x 10^5 and B = 9 x 10^4. How many times larger…A digital counter shows 10^6. Each second it is multiplied by 10, then 10 minutes later…The area of a square plot in a survey is recorded as (2 x 10^2) m by (5 x 10^1) m. Work…Using laws of exponents, 10^7 / 10^4 = ?