Questions by sumit

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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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For each hook-up, determine whether there is a single repeater machine that will do the same work. If so, describe or draw it (a) (b) (c) (d)(e)

asked Jan 17, 2022 in 8th-maths

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The diameter of the Sun is `1.4 xx 10^9` m and the diameter of the Earth is `1.2756 xx 10^7` m. Compare their diameters by

asked Jan 17, 2022 in 8th-maths

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Mass of Mars is `6.42 xx 10^29` kg and mass of the Sun is `1.99 xx 10^30` kg. What is the total

asked Jan 17, 2022 in 8th-maths

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The marked price of an article is Rs 80 and it is sold at Rs 76, then the discount rate

asked Jan 17, 2022 in 8th-maths

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_________ is a reduction on the marked price of the

asked Jan 17, 2022 in 8th-maths

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

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

asked Jan 17, 2022 in 8th-maths

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A man purchased a bicycle for Rs 1,040 and sold it for Rs 800. His gain per cent is

asked Jan 17, 2022 in 8th-maths

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Selling price of 9 articles is equal to the cost price of 15 articles. In this transaction there is profit of `66 2/3

asked Jan 17, 2022 in 8th-maths

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Sales tax is always calculated on the cost price of an item and is added to the value of the

asked Jan 17, 2022 in 8th-maths

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Find the S.P. if (a) M.P. = Rs 5450 and discount = 5% (b) M.P. = Rs 1300 and discount =

asked Jan 17, 2022 in 8th-maths

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The marked price of an article is Rs 500. The shopkeeper gives a discount of 5% and still makes a profit of 25%. Find the cost price of the

asked Jan 17, 2022 in 8th-maths

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How much more per cent seats were won by X as compared to Y in Assembly Election in the state based on the data given below. Party Won(out of 294) XYZW 1581051813

asked Jan 17, 2022 in 8th-maths

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Achal bought a second-hand car for Rs 2,25,000 and spend Rs 25,000 for repairing. If he sold it for Rs 3,25,000, what is his profit per

asked Jan 17, 2022 in 8th-maths

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Rahim borrowed Rs 10,24,000 from a bank for one year. If the bank charges interest of 5% per annum, compounded half-yearly, what amount will he have to pay after the given time period. Also, find the interest paid by

asked Jan 17, 2022 in 8th-maths

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A car covers a distance in 40 minutes with an average speed of 60 km per hour. The average speed to cover the same distance in 30 minutes

asked Jan 17, 2022 in 8th-maths

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Which of the following is in direct

asked Jan 17, 2022 in 8th-maths

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If x varies directly as y, then x 12 6 y 48

asked Jan 17, 2022 in 8th-maths

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In case of inverse proportion, `(a_2)/−

asked Jan 17, 2022 in 8th-maths

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