Question

please give all answer​

Answer 1

Answer:

Please mark me as the Brainliest

Step-by-step explanation:

1. length of cuboid = 80cm

breadth of cuboid = 40cm

height of cuboid = 20cm

Surface of cuboid with open top = 2*(l+b)*h + l*b

= 2*(80+40)*20 + 80*40

= 2*(120)*20 + 3200

= 4800 + 3200

= 8000 cm²

2. (√8 - √2)*(√8 + √2)

= [ (√8)² - (√2)² ]

= (8 - 2)

= 6

3. Radius of cone = 7 cm

Area of curved surface of cone = 176 cm²

Area of cone(L) = π*r*s

s = L / (π*r)

= 176 / (3.14*7)

= 176 / 21.98

s = 8 cm (Approximately)

4. The numbers given 994, 996, 998, 1002, 1000.

Mean = (994 + 996 + 998 + 1000 + 1002) / 5

= 4990 / 5

Mean = 998

5. The longest chord of a circle is a diameter of the circle.

6. The coefficient of x² in 17 - 2x + 7x² is 7.