Questions by vaibhav

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Factorise the expressions and divide them as directed: `(x^3 + x^2 – 132x) -: x (x –

asked Jan 18, 2022 in 8th-maths

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Factorise the expressions and divide them as directed: `(x^4 – 16) -: x^3 + 2x^2 + 4x +

asked Jan 18, 2022 in 8th-maths

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The area of a square is given by `4x^2 + 12xy + 9y^2`. Find the side of the

asked Jan 18, 2022 in 8th-maths

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If a + b = 25 and `a^2 + b^2 = 225`, then find

asked Jan 18, 2022 in 8th-maths

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The standard form of `(1/100000000)` is

asked Jan 18, 2022 in 8th-maths

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The usual form of `2.39461 xx 10^6` is

asked Jan 18, 2022 in 8th-maths

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The standard form for 0.000000008 is

asked Jan 18, 2022 in 8th-maths

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On multiplying _________ by `2^(–5)` we get

asked Jan 18, 2022 in 8th-maths

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Find the multiplicative inverse of `(–7)^(–2) -:

asked Jan 18, 2022 in 8th-maths

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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 18, 2022 in 8th-maths

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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 18, 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 18, 2022 in 8th-maths

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A half-life is the amount of time that it takes for a radioactive substance to decay to one half of its original quantity. Suppose radioactive decay causes 300 grams of a substance to decrease to `300 xx 2^(–3)` grams after 3 half-lives. Evaluate `300 xx 2^(–3)` to determine how many grams of the substance are left. Explain why the expression `300 xx 2^(–n)` can be used to find the amount of the substance that remains after n

asked Jan 18, 2022 in 8th-maths

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Fill in the blanks

asked Jan 18, 2022 in 8th-maths

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Find three machines that can be replaced with hook-ups of `(xx 5)`

asked Jan 18, 2022 in 8th-maths

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Find the compound interest on Rs 48,000 for one year at 8% per annum when compounded half

asked Jan 18, 2022 in 8th-maths

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If 90% of x is 315 km, then the value of x

asked Jan 18, 2022 in 8th-maths

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Latika bought a teapot for Rs 120 and a set of cups for Rs 400. She sold teapot at a profit of 5% and cups at a loss of 5%. The amount received by her

asked Jan 18, 2022 in 8th-maths

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The original price of a washing machine which was bought for Rs 13,500 inclusive of 8% VAT

asked Jan 18, 2022 in 8th-maths

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_________ is a reduction on the marked price of the

asked Jan 18, 2022 in 8th-maths

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