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See Mellie's solution below.

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Surface area of cone base = pi*r² where r is the radius (15)

Surface area of slanted surface = pi*r*L where L is the slant height

L = √(r² + h²)  where h is the height (35)

Plug the numbers in and add up the two areas.

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Probability of getting Megaball:  1/27

Probability of getting 5 Winnerballs = (5/44)*(4/43)*(3/42)*(2/41)*(1/40)

Overall probability of winning = (1/27)*(5/44)*(4/43)*(3/42)*(2/41)*(1/40) = 1/29322216 ≈ 3.4*10^-8

Edited to correct error

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He needs to buy 1500 - 850 litres  = 650 litres

Cost = 650litres * 67.2p/litre *0.95   = 41496p = £41.50 to the nearest p (assuming the p represents pence Sterling)

The 0.95 is because he pays 95% of the basic price (i.e. 5% off)

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Oh right, this is only for the first. Thanks Alan:

Since we can add expected values of independent events, the expected value of the sum is the sum of the expected values of each.

Since we are just as likely to pick x as 1-x, the expected value of x (and likewise y) is equal to 1/2.

Therefore the expected value of the sum is 1/2+1/2=1.

I think it's £41.51

Let side of cube be s.  Then length of inner diagonal = √(s² + s² + s²)  = s √3, so s = 18/√3 cm

Volume of cube  = s³ = (18/√3)³ = 18³/3√3 =  18³*√3/9 = 2√3 * 18² = 648√3 cm³

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Let M be the mass. Then

M = 100 + M/2

Subtract M/2 from both sides

M/2 = 100

Multiply both sides by 2

M = 200 kg  (Heavy man!)

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How do you not........you know know my class when a boy cant spell ignore...hes asked to go back to 2nd standard...you dont know what aka is?.....your level of education has gone deep down near the core....better go to nursery!(btw its for Rosala)

what is aka?

Your in highschool now aka you are a young woman!

give me a proof i am.........im a girl you scary MAN

They arent jokes they are truths. You probably cant understand because you are a WOMAN!

i read that but...these jokes.....arent my level....too low for me to bend down

of course it crossed your head rosala. Man too bad BJ took all of the dum dum suckers.....

no......what......that just crossed my head....dear zegrose you need rest

A lotus in winter yeah

were a lotus together....thats all

Ha! Ladies? Your a rose for one rosala and two melodys a dinosaur so.....

Zegroes  -   dream on!

and MAN tooo......goodnight melody...

Sleep tight melody....Dont let the dinosaurs bite

whose a WOMEN here......were girls and ladies....third brother of the GODZILLA

you women will never understand that MEN are always right!