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Verify the following: `(a^2 – b^2) (a^2 + b^2) + (b^2 – c^2) (b^2 + c^2) + (c^2 – a^2) + (c^2 + a^2) =

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

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For a fixed base, if the exponent decreases by 1, the number

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

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`((-7)/5)^(-1)` is equal

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

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Very small numbers can be expressed in standard form by using _________

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

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By multiplying `(10)^5` by `(10)^(–10)` we get

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

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By multiplying `(5/3)^4` by ________ we get

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

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The usual form for `2 xx 10^(–2)` is not equal to

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

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Express `16/18` and `(-16)/18` as powers of a rational

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

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Express as a power of a rational number with negative exponent. (a) `(((-3)/2)^(-2))^(-3)` (b) `(2^5 -: 2^8) xx

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

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Simplify: -1. `(49 xx z^(-3))/(7^(-3) xx 10 xx z^(-5))`

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

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Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression `3^(–t)`. (a) What fraction of substance remains after 7 half-lives? (b) After how many half-lives will the fraction be `1/243` of the

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

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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 by Simran (1.8k points)

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By selling 50 pens, a shopkeeper lost the amount equal to the selling price of 10 pens. His loss per cent is

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

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_________ is charged on the sale of an item by the government and is added to the bill

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

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The cost of a sewing machine is Rs 7,000. Its value depreciates at 8% p.a. Then the value of the machine after 2 years is Rs

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

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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 by sumit (1.6k points)

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Three bags contain 64.2 kg of sugar. The second bag contains `4/5` of the contents of the first and the third contains `42 1/2%` of what there is in the second bag. How much sugar is there in each

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

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In 2007 – 08, the number of students appeared for Class X examination was 1,05,332 and in 2008–09, the number was 1,16,054. If 88,151 students pass the examination in 2007–08 and 103804 students in 2008–09. What is the increase or decrease in pass % in Class X

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

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Given the principal = Rs 40,000, rate of interest = 8% p.a. compounded annually. Find (a) Interest if period is one year. (b) Principal for 2nd year. (c) Interest for 2nd year. (d) Amount if period is 2

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

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Ayesha announced a festival discount of 25% on all the items in her mobile phone shop. Ramandeep bought a mobile phone for himself. He got a discount of Rs 1,960. What was the marked price of the mobile

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

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