Recent questions tagged marks3

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The figure shows the dimensions of a wall having a window and a door of a room. Write an algebraic expression for the area of the wall to be painted.

asked Jan 17, 2022 in 8th-maths by Arun (1.7k points)

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Match the expressions of column I with that of column II: Column I Column II (1) `(21x + 13y)^2` (a) `441x^2 – 169y^2` (2) `(21x – 13y)^2` (b) `441x^2 + 169y^2 + 546xy` (3) `(21x – 13y) (21x + 13y)` (c) `441x^2 + 169y^2 – 546xy` (d) `441x^2 – 169y^2 + 546xy`

asked Jan 17, 2022 in 8th-maths by nikhil (1.8k points)

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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

asked Jan 17, 2022 in 8th-maths by nikhil (1.8k points)

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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

asked Jan 17, 2022 in 8th-maths by purvi (1.8k points)

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Planet A is at a distance of `9.35 xx 10^6` km from Earth and planet B is `6.27 xx 10^7` km from Earth. Which planet is nearer to

asked Jan 17, 2022 in 8th-maths by Simran (1.8k points)

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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

asked Jan 17, 2022 in 8th-maths by sumit (1.6k points)

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An insect is on the 0 point of a number line, hopping towards 1. She covers half the distance from her current location to 1 with each hop. So, she will be at `1/2` after one hop, `3/4` after two hops, and so on. (a) Make a table showing the insect’s location for the first 10

asked Jan 17, 2022 in 8th-maths by nishit (1.8k points)

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Predicting the ones digit, copy and complete this table and answer the questions that follow. (a) Describe patterns you see in the ones digits of the

asked Jan 17, 2022 in 8th-maths by vaibhav (1.7k points)

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Astronomy The table shows the mass of the planets, the sun and the moon in our solar system. (a) Write the mass of each planet and the Moon in scientific

asked Jan 17, 2022 in 8th-maths by uday (1.6k points)

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Investigating Solar System The table shows the average distance from each planet in our solar system to the sun. (a) Complete the table by expressing the distance from each planet to the Sun in scientific

asked Jan 17, 2022 in 8th-maths by sumit (1.6k points)

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This table shows the mass of one atom for five chemical elements. Use it to answer the question given. Element Mass of atom (kg) TitaniumLeadSilverLithiumHydrogen `7.95 × 10^(–26)` `3.44 × 10^(–25) ``1.79 × 10^(–25)``1.15 × 10^(–26)``1.674 × 10^(–27) `

asked Jan 17, 2022 in 8th-maths by vaibhav (1.7k points)

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This table shows the mass of one atom for five chemical elements. Use it to answer the question given. Element Mass of atom (kg) TitaniumLeadSilverLithiumHydrogen `7.95 × 10^(–26)` `3.44 × 10^(–25) ``1.79 × 10^(–25)``1.15 × 10^(–26)``1.674 × 10^(–27) `

asked Jan 17, 2022 in 8th-maths by Simran (1.8k points)

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This table shows the mass of one atom for five chemical elements. Use it to answer the question given. Element Mass of atom (kg) TitaniumLeadSilverLithiumHydrogen `7.95 × 10^(–26)` `3.44 × 10^(–25) ``1.79 × 10^(–25)``1.15 × 10^(–26)``1.674 × 10^(–27) `

asked Jan 17, 2022 in 8th-maths by nishit (1.8k points)

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The planet Uranus is approximately 2,896,819,200,000 metres away from the Sun. What is this distance in standard

asked Jan 17, 2022 in 8th-maths by sumit (1.6k points)

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An inch is approximately equal to 0.02543 metres. Write this distance in standard

asked Jan 17, 2022 in 8th-maths by Arun (1.7k points)

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The volume of the Earth is approximately `7.67 xx 10^(–7)` times the volume of the Sun. Express this figure in usual

asked Jan 17, 2022 in 8th-maths by purvi (1.8k points)

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An electron’s mass is approximately `9.1093826 xx 10^(–31)` kilograms. What is this mass in

asked Jan 17, 2022 in 8th-maths by Simran (1.8k points)

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At the end of the 20th century, the world population was approximately `6.1 xx 10^9` people. Express this population in usual form. How would you say this number in

asked Jan 17, 2022 in 8th-maths by nishit (1.8k points)

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While studying her family’s history. Shikha discovers records of ancestors 12 generations back. She wonders how many ancestors she has had in the past 12 generations. She starts to make a diagram to help her figure this out. The diagram soon becomes very complex. (a) Make a table and a graph showing the number of ancestors in each of the 12

asked Jan 17, 2022 in 8th-maths by vaibhav (1.7k points)

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About 230 billion litres of water flows through a river each day. How many litres of water flows through that river in a week? How many litres of water flows through the river in an year? Write your answer in standard

asked Jan 17, 2022 in 8th-maths by nishit (1.8k points)

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