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Simplify and express the result in power notation with positive exponent. `(3^(– 7) ÷ 3^(– 10)) xx 3^(– 5)`

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

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Express the following numbers in usual form. `4.5 xx

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

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A loaded truck travels 14 km in 25 minutes. If the speed remains the same, how far can it travel in 5

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

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A contractor estimates that 3 persons could rewire Jasminder’s house in 4 days. If, he uses 4 persons instead of three, how long should they take to complete the

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

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Find the scale. (a) Actual size 12 m Drawing size 3 cm (b) Actual size 45 feet Drawing size 5

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

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Using suitable identities, evaluate the following. `105 xx

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

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What should be added to `4c (– a + b + c)` to obtain `3a (a + b + c) – 2b(a – b +

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

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One Fermi is equal to `10^(–15)` metre. The radius of a proton is 1.3 Fermis. Write the radius of a proton in metres in standard

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

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Ms. Anita has to drive from Jhareda to Ganwari. She measures a distance of 3.5 cm between these villages on the map. What is the actual distance between the villages if the map scale is 1 cm = 10

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

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If xy = 10, then x and y vary ______ with each

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

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From a pipe of inner radius 0.75 cm, water flows at the rate of 7 m per second. Find the volume in litres of water delivered by the pipe in 1

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

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Draw a histogram for the frequency table made for the data in Question 3, and answer the following questions. The weekly wages (in Rs) of 30 workers in a factory are. 830, 835, 890, 810, 835, 836, 869, 845, 898, 890, 820, 860, 832, 833, 855, 845,

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

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Without adding, find the sum. 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 +

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

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Simplify. `(a + b) (c – d) + (a – b) (c + d) + 2 (ac +

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

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Using Identity (II), find

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

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Can a polyhedron have for its faces 3 triangles?

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

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Find the side of a cube whose surface area is 600

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

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Daniel is painting the walls and ceiling of a cuboidal hall with length, breadth and height of 15 m, 10 m and 7 m respectively. From each can of paint 100 `m^2` of area is painted. How many cans of paint will she need to paint the

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

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A train is moving at a uniform speed of 75 km/hour. How far will it travel in 20

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

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A 5 m 60 cm high vertical pole casts a shadow 3 m 20 cm long. Find at the same time the height of a pole which casts a shadow 5m

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

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