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4b )
Tv = π x r² x h
= 3.14 x 8 cm x 8 cm x 10 cm
= 25.12 cm x 8 cm x 10 cm
= 200.96 cm x 10 cm
= 2009.6 cm³

Cv = ⅓ π x r² x h
= ⅓ x 3.14 x 8 cm x 8 cm x 15 cm
= 3.14 x 8 cm x 8 cm x 5 cm
= 25.12 cm x 8 cm x 5 cm
= 200.96 cm x 5 cm
= 1004.8 cm³

V = Tv + Cv
= 2009.6 cm³ + 1004.8 cm³
= 3014.4 cm³

Yes.

3 )
d = U2 - U1
d = 55.000 - 50.000 = 5.000
Sn = ½ n { 2U1 + ( n - 1 ) x d }
Sn = 10/2 { 2 x 50.000 + ( 10 - 1 ) x 5.000 }
Sn = 5 { 100.000 + ( 9 x 5.000 ) }
Sn = 5 { 100.000 + 45.000 }
Sn = 5 { 145.000 }
Sn = 725.000

2 )
40 - 12 = 28
28 - 7 = 21

28/21 = x/15
4/3 = x/15
3x = 60
x = 60/3
x = 20

20 - 15 = 5

What

≧∇≦

Why.....
U need to live...

But.. I have a life xP

U need a doctor for ur math sick