A solid metal sphere with diameter 10cm needs to be covered with a protective material which costs £0.29 per cm2. How much will it cost to cover the sphere with the material? Give your answer rounded to 2 DP.

1083.45

Step-by-step explanation:

Diameter = 2r

Radius = 5cm because the diameter is 10.

4 pie r^2 is the surface area. = 314.2.

314.2/0.29 = 1083.45 Pounds

a² + b²= c²

24² + 7² = c²

c= 25

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: