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Maths
8. exponents and powers
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Q125 of 196 Page 249

Planet A is at a distance of 9.35 × 106 km from Earth and planet B is 6.27 × 107 km from Earth. Which planet is nearer to Earth?

Distance between Planet A and Earth = 9.35 × 106 km = 0.935 × 107 km


Distance between Planet B and Earth = 6.27 × 107 km


Clearly, planet A is nearer to Earth than planet B.


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123

A new born bear weighs 4 kg. How many kilograms might a five year old bear weigh if its weight increases by the power of 2 in 5 years?

124

The cells of a bacteria double in every 30 minutes. A scientist begins with a single cell. How many cells will be there after

a. 12 hours


b. 24 hours?

126

The cells of a bacteria double itself every hour. How many cells will there be after 8 hours, if initially we start with 1 cell. Express the answer in powers.

127

An insect is on the 0 point of a number line, hopping towards 1. She covers the distance from her current location to 1 with each hop. So, she will be at after one hop, after two hops, and so on.


a. Make a table showing the insect’s location for the first 10 hops.


b. Where will the insect be after n hops?


c. Will the insect ever get to 1? Explain.

Questions · 196
8. exponents and powers
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