Questions by yogita

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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

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The multiplicative inverse of `(-5/9)^-99`

asked Jan 17, 2022 in 8th-maths

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The standard form for 234000000

asked Jan 17, 2022 in 8th-maths

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For any two non-zero rational numbers x and y, `x^4 -: y^4` is equal

asked Jan 17, 2022 in 8th-maths

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asked Jan 17, 2022 in 8th-maths

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`[2^(–1) + 3^(–1) + 4^(–1)]^0` =

asked Jan 17, 2022 in 8th-maths

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To add the numbers given in standard form, we first convert them into numbers with __

asked Jan 17, 2022 in 8th-maths

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The multiplicative inverse of `(3/2)^2` is not equal to

asked Jan 17, 2022 in 8th-maths

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asked Jan 17, 2022 in 8th-maths

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`(2^n xx 2^6)/2^(-13) =

asked Jan 17, 2022 in 8th-maths

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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

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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

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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

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One Fermi is equal to `10^(–15)` metre. The radius of a proton is 1.3 Fermis. Write the radius of a proton in metres in standard

asked Jan 17, 2022 in 8th-maths

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There are 864,00 seconds in a day. How many days long is a second? Express your answer in scientific

asked Jan 17, 2022 in 8th-maths

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What happens when 1 cm worms are sent through these hook-ups?

asked Jan 17, 2022 in 8th-maths

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Sanchay put a 1cm stick of gum through a `(1 xx 3^(–2))` machine. How long was the stick when it came

asked Jan 17, 2022 in 8th-maths

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If possible, find a hook-up of prime base number machine that will do the same work as the given stretching machine. Do not use `(xx 1)` machines.

asked Jan 17, 2022 in 8th-maths

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Long back in ancient times, a farmer saved the life of a king’s daughter. The king decided to reward the farmer with whatever he wished. The farmer, who was a chess champion, made an unusal request: “I would like you to place 1 rupee on the first square of my chessboard, 2 rupees on the second square, 4 on the third square, 8 on the fourth square, and so on, until you have covered all 64 squares. Each square should have twice as many rupees as the previous square.” The king thought this to be too less and asked the

asked Jan 17, 2022 in 8th-maths

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If a = – 1, b = 2, then find the value of the following: (1) `a^b + b^a` (2) `a^b – b^a` (3) `a^b xx b^2` (4) `a^b ¸

asked Jan 17, 2022 in 8th-maths

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