Asoft drink can have a diameter of 6 cm and a height of 11.5 cm. how much aluminum is used to make the can

Radius = Diameter ÷ 2

Radius = 6 ÷ 2 = 3cm

Surface area = 2πr² + 2πrh

Surface area = 2 π (3)² + 2 π (3) (11.5) = 272.32 cm² (nearest hundredth)

272.32 cm²

You're looking for the total surface of a cylinder, which is composed by two circles, and a rectangle conntecting them.

The area of the two circles is given by

The base of the rectangle is congruent to the circumference of the base circle, and the height is given. The circumference is given by

So, the area of the rectangle is

The cylinder is consists of two circles and the rectangle, so its surface is

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step by step resolutions

1) n+n+1+n+2=51

3n+3=51

3n=48

n=16

the three numbers are 16, 17 and 18.

2) x+15=4x

3x=15

x=5

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3) the two digits are x and y.

y=3x

(10x+y)+(10y+x)=88

y=3x

11x+11y=88

y=3x

x+y=8

x+3x=8

x=2

the original number can be either 28 or 82.

4) n+(n+2)+(n+4)=48

3n+6=48

3n=42

n=14

the numbers are 14, 16 and 18.

5) y=x+3

10y+x+10x+y=143

y=x+3

11x+11y=143

y=x+3

x+y=13

x+x+3=13

2x=10

x=5

the original number can be 57 or 75.

hope this !