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Simplify the expressions and evaluate them as directed: 3y (2y – 7) – 3 (y – 4) – 63 for y =

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

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Carry out the multiplication of the expressions in each of the following pairs. `ab, a –

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

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Multiply `(a^2 + 2b^2)` and (5a –

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

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Multiply the binomials. (a + 3b) and (x +

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

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Use a suitable identity to get each of the following products. (2a – 7) (2a –

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

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Using `(x + a) (x + b) = x^2 + (a + b) x + ab`, find `103 xx 98`

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

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For each given solid, identify the top view, front view and side view. #fig (i) (ii)

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

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Verify Euler’s formula for these

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

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Mrs. Kaushik has a square plot with the measurement as shown in the figure. She wants to construct a house in the middle of the plot. A garden is developedaround the house. Find the total cost of developing a garden around the house at the rate of Rs 55 per

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

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Find the area of a rhombus whose diagonals are of lengths 10 cm and 8.2

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

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The area of a trapezium shaped field is 480 `m^2` , the distance between two parallel sides is 15 m and one of the parallel side is 20 m. Find the other parallel

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

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An aquarium is in the form of a cuboid whose external measures are `80 cm xx 30 cm xx 40 cm`. The base, side faces and back face are to be covered with a coloured paper. Find the area of the paper

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

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There are two cuboidal boxes as shown in the adjoining figure. Which box requires the lesser amount of material to

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

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Find the value of m for which `5^m ÷ 5^(– 3) =

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

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Express the following numbers in usual form. `3.02 xx 10^(– 6)`

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

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In a stack there are 5 books each of thickness 20mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the

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

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Which of the following are in inverse proportion?(i) The number of workers on a job and the time to complete the job.(ii) The time taken for a journey and the distance travelled in a uniform speed.(iii) Area of cultivated land and the crop harvested.(iv) The time taken for a fixed journey and the speed of the vehicle.(v) The population of a country and the area of land per

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

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`[(2/13)^(-1) -: (2/13)^3]^3 xx (2/13)^(-13)` =

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

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`(–5)^(–2) xx (–5)^(–3) =

asked Jan 17, 2022 in 8th-maths by Arun (1.7k 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 sumit (1.6k points)

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