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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

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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

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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 17, 2022 in 8th-maths

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By what number should `(–8)^(–3)` be multiplied so that that the product may be equal to

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Overhead charges, if any, are sometimes included in the cost

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If a % is the discount per cent on a marked price x, then discount

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A jacket was sold for Rs 1,120 after allowing a discount of 20%. The marked price of the jacket

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

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Increase of a number from 150 to 162 is equal to increase of _________ per

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The discount on an item for sale is calculated on the

asked Jan 17, 2022 in 8th-maths

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The marked price of an article when it is sold for Rs 880 after a discount of 12% is

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5% sales tax is charged on an article marked Rs 200 after allowing a discount of 5%, then the amount payable is

asked Jan 17, 2022 in 8th-maths

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If the discount of Rs y is available on the marked price of Rs x, then the discount percent is `x/y ´100

asked Jan 17, 2022 in 8th-maths

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In 1975, the consumption of water for human use was about 3850 cu.km/year. It increased to about 6000 cu.km/year in the year 2000. Find the per cent increase in the consumption of water from 1975 to 2000. Also, find the annual per cent increase in consumption (assuming water consumption increases

asked Jan 17, 2022 in 8th-maths

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In Delhi University, in the year 2009 – 10, 49,000 seats were available for admission to various courses at graduation level. Out of these 28,200 seats were for the students of General Category while 7,400 seats were reserved for SC and 3,700 seats for ST. Find the per centage of seats available for

asked Jan 17, 2022 in 8th-maths

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Kritika ordered one pizza and one garlic bread from a pizza store and paid Rs 387 inclusive of taxes of Rs 43. Find the

asked Jan 17, 2022 in 8th-maths

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At a toy shop price of all the toys is reduced to 66% of the original price. (a) What is the sale price of a toy that originally costs Rs 90? (b) How much money would you save on a toy costing Rs

asked Jan 17, 2022 in 8th-maths

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Amrita takes 18 hours to travel 720 kilometres. Time taken by her to travel 360 kilometres is

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If two cardboard boxes occupy 500 cubic centimetres space, then how much space is required to keep 200 such

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x and y are said to vary directly with each other if for some positive number k, ______

asked Jan 17, 2022 in 8th-maths

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