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Find the value of (i) `(6.25 6.25 –1.75 1.75)/4.5` (ii) `(198 198 –102

asked Jan 18, 2022 in 8th-maths by nishit (1.8k points)

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The human body has about 100 billion cells. This number can be written in exponential form

asked Jan 18, 2022 in 8th-maths by Arun (1.7k points)

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The value of `(2/5)^-2`

asked Jan 18, 2022 in 8th-maths by krutika (1.7k points)

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Which of the following is equal to `(-3/4)^(-3)`

asked Jan 18, 2022 in 8th-maths by sumit (1.6k points)

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The value of `(7^(–1) – 8^(–1))^(–1) – (3^(–1) – 4^(–1))^(–1)`

asked Jan 18, 2022 in 8th-maths by Simran (1.8k points)

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Express `3^(–5) xx 3^(–4)` as a power of 3 with positive

asked Jan 18, 2022 in 8th-maths by Simran (1.8k points)

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By what number should `(–15)^(–1)` be divided so that quotient may be equal to `(–15)^(–1)`

asked Jan 18, 2022 in 8th-maths by yogita (1.8k points)

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

asked Jan 18, 2022 in 8th-maths by vaibhav (1.7k points)

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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 by vaibhav (1.7k points)

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Neha needs to stretch some sticks to `25^2` times their original lengths, but her `(xx2^5)` machine is broken. Find a hook-up of two repeater machines that will do the same work as a `(xx25^2)` machine. To get started, think about the hookup you could use to replace the `(xx2^5)` machine.

asked Jan 18, 2022 in 8th-maths by krutika (1.7k points)

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Find x -1. (1) `-(1/7)^(-5) -: -(1/7)^(-7) = (-7)^x` (2) `(2/5)^(2x+6) xx (2/5)^3 =

asked Jan 18, 2022 in 8th-maths by Arun (1.7k points)

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A shirt with marked price Rs 800 was sold at Rs 680. The rate of discount allowed on the shirt

asked Jan 18, 2022 in 8th-maths by nikhil (1.8k points)

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Rs 1600 lent at a compound interest of 5% per annum, compounded half yearly for one year will amount

asked Jan 18, 2022 in 8th-maths by purvi (1.8k points)

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Arnav buys a book costing Rs 600. If the rate of sales tax is 7%, then the total amount payable by him is Rs

asked Jan 18, 2022 in 8th-maths by purvi (1.8k points)

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A number is increased by 20% and then it is decreased by 20%. Find the net increase or decrease per

asked Jan 18, 2022 in 8th-maths by uday (1.6k points)

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Vishakha offers a discount of 20% on all the items at her shop and still makes a profit of 12%. What is the cost price of an article marked at Rs

asked Jan 18, 2022 in 8th-maths by krutika (1.7k points)

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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 by vaibhav (1.7k points)

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Shyama purchases a scooter costing Rs 36,450 and the rate of sales tax is 9%, then the total amount paid by her

asked Jan 18, 2022 in 8th-maths by nishit (1.8k points)

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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 by vaibhav (1.7k points)

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Discount = Discount % of

asked Jan 18, 2022 in 8th-maths by nikhil (1.8k points)

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