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Express the following numbers in usual form. `3 xx 10^(–

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

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Match the expressions of column I with that of column II: Column I Column II (1) `(21x + 13y)^2` (a) `441x^2 – 169y^2` (2) `(21x – 13y)^2` (b) `441x^2 + 169y^2 + 546xy` (3) `(21x – 13y) (21x + 13y)` (c) `441x^2 + 169y^2 – 546xy` (d) `441x^2 – 169y^2 + 546xy`

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

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The radius of a circle is 7ab – 7bc – 14ac. Find the circumference of the circle.

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

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Find the value of a, if `9a = 76^2 –

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

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Verify the following: `(5x + 8)^2 – 160x = (5x –

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

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Here is a key board of a harmonium: (a) Find the ratio of white keys to black keys on the keyboard. (b) What is the ratio of black keys to all keys on the given keyboard. (c) This pattern of keys is repeated on larger keyboard. How many black keys would you expect to find on a keyboard with 14 such

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

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Many schools have a recommended students-teacher ratio as 35:1. Next year, school expects an increase in enrolment by 280 students. How many new teachers will they have to appoint to maintain the students-teacher

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

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The walls and ceiling of a room are to be plastered. The length, breadth and height of the room are 4.5 m, 3 m, and 350 cm respectively. Find the cost of plastering at the rate of Rs 8 per

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

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Write. The rational numbers that are equal to their

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

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A bag has 4 red balls and 2 yellow balls. (The balls are identical in all respects other than colour). A ball is drawn from the bag without looking into the bag.What is probability of getting a red ball? Is it more or less than getting a yellow

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

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How many numbers lie between squares of the following numbers? 12 and 13

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

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Fifteen years from now Ravi’s age will be four times his present age. What is Ravi’s present

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

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Solve the equation for y

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

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Construct a quadrilateral PQRS where PQ = 4 cm,QR = 6 cm, RS = 5 cm, PS = 5.5 cm and PR = 7

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

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Find CI paid when a sum of Rs 10,000 is invested for 1 year and 3 months at `8 1/2%` per annum compounded

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

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Identify the terms, their coefficients for each of the following expressions. `5xyz^2 – 3zy`

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

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Using identities, evaluate.

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

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Draw the front view, side view and top view of the given objects. A nut -(d) A hexagonal block

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

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Can a polyhedron have 10 faces, 20 edges and 15

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

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