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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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Use the properties of exponents to verify that each statement is true. (a) `1/4(2^n) = 2^(n-2)` (b) `4(n-1) = 1/4(4)^n` (c) `25(5^(n–2)) =

asked Jan 17, 2022 in 8th-maths by nishit (1.8k 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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Ashima took a loan of Rs 1,00,000 at 12% p.a. compounded half yearly. She paid Rs 1,12,360. If (1.06)2 is equal to 1.1236, then the period for which she took the loan

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

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For calculation of interest compounded half yearly, keeping the principal same, which one of the following is

asked Jan 17, 2022 in 8th-maths by Arun (1.7k 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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Four times a number is a _________ % increase in the

asked Jan 17, 2022 in 8th-maths by vaibhav (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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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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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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On selling a chair for Rs 736, a shopkeeper suffers a loss of 8%. At what price should he sell it so as to gain

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

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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 by purvi (1.8k points)

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If x and y are inversely proportional then _____ = k where k is positive

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

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Side of a rhombus and its perimeter are in ______

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

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Under the condition that the temperature remains constant, the volume of gas is inversely proportional to its pressure. If the volume of gas is 630 cubic centimetres at a pressure of 360 mm of mercury, then what will be the pressure of the gas if its volume is 720 cubic centimetres at the same

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

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Both u and v vary directly with each other. When u is 10, v is 15, which of the following is not a possible pair of corresponding values of u and

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

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The number of teeth and the age of a person

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

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A truck needs 54 litres of diesel for covering a distance of 297 km. The diesel required by the truck to cover a distance of 550 km

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

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Both x and y vary directly with each other and when x is 10, y is 14, which of the following is not a possible pair of corresponding values of x and

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

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If 12 pumps can empty a reservoir in 20 hours, then time required by 45 such pumps to empty the same reservoir is ______

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

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