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Maths - Class 7 question

saba_amna
A letter costs x pence to post. The Cost of posting 20 such letters is £q. Write down a formula for q.

one grapefruit costs y pence. The cost of n such grapefruit is £L. Write down a formula for L.

Hey hi, hope dis is right

£q=20 x X

£L=Y x N

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How old is Eric?

mummy2506

Doug, Eric and Fred all wrote down their present ages and they added up to 45. They rotated their present ages through 180 degrees and then they added up to 183. Fred is 2 years older than Eric and Doug's age is the same upside down.

 

How old is Eric??

Eric's age = x
Doug = z
Fred = y

Fred is 2 years older than eric so y = x + 2

thus equation we are after:

x + (x+ 2) + z = 183

if Doug's age is same upside down it could either be 11, 33, 44, but it can't be 33 or 44 because these won't be figures if turned 180 degrees.

45 - 11 = 34
34 / 2 = 17

Thus Fred is 18 and Eric is 16.

eric's age = x= 16
doug = z = 11
fred = y = x + 2 = 18

16+11+18 = 45

Turn them upside down and you get

11 + 91 + 81 = 183!

Eric is 6 years of age.

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number

745707
try this now 700000 x 700000 = ? due 24 / 3 / 06

the answer is 490000000000

u times 7 by 7 u get 49 and then just add all the zero's on.

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Hard maths questoion

Emz!!!

What is:

199/36*2<90>46=? Then * the answer by 11.

Emma xxx

we a calculator and work out each bit at a time....and yeh..use BODMAS

by the way you don't really need the "<90>46"...

Its just the first half that you need to calculate

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Maths question

Emz!!!

What is 1000*75/12? I have to use a calculator for this but I havn't got one.

Can someone tell me what the answer is?

Thnx, Emma xxx

its 6250

if you have windows:

look in programs then accessories calculator should be in there

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sum

745707
2x2   2x3  2x4 try now from alvaro 16/1/2006 is due

2 x 2 = 2 + 2 = 4

2 x 3 = 2 + 2 + 2 = 6

2 x 4 = 2 + 2 + 2 + 2 = 8

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help????

bangra

hi

could anyone tell me wat and how to work out the diameter and radius and could anyone explain to me what formaulas you use.....

thanks.....

hi

you can work out the diameter he's the formulas

C = pie d

C = 2 pie r

 

Because the diameter is twice the length of the radius,

the formulas are easy jus txt me and i'll tell you..

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help????

bangra

hi

could anyone tell me wat and how to work out the diameter and radius and could anyone explain to me what formaulas you use.....

thanks.....

i cud write it all, but this site explains it perfectly and gives examples and even a little test at the bottom.

http://www.mathgoodies.com/lessons/vol2/circumference.html

Hope this helps,

Dave

btw if u see a . in the equation that means multiply

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URGENT!!!!!

fes1

 COULD ANYONE TELL ME SOME DECENT WEBSITES FOR REVISION ON PYTHAGORAS THEROM AND POWERS.

 

THANXS

s-cool.com>>>dat should help anyone
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help

bangra
what do the sides of a triangle measure and how do you work out the area of a trapezium
The sides of a triangle measure up to 180 and to work out the area of a trapezium you use this formula a+b/2 hope it helps
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