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ok thank you but i'll give some more information i hope it helps you

i have an exercise to which i have to measure dissolved oxygen per 15sec for 2min, per 30sec for 4min and per 1min (the exercise is called cod if you know it).

then i have to depict these measurements to a table e.g

 but i don't know how to depict the measurements of time on the table.... 

That's what i meant

ur most welcome ! 

Thank you Rosala 

Thanks for answering! It helped me a lot! 

Thankss for answering! it really helped! 

ive understood now !

thank u melody for the help ! u dod a good thing so i wanted to give u thumbs uu ! so thumbs for the second answer !

Hi Rosala,

It is good that you are still telling me you don't understand!

Why don't you forget about the algebra bit.  Maybe you are not ready for that yet.  Look at the last bit that i wrote.  Try to make sense of that.

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You could do this more simply.

The difference in age is 25years so when the son is 25 the father must be 50. (that is twice as much)

The boy is 7 now.  25-7=18

So this will happen in 18 years time!

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Just try thinking about that!

Area and volume

i know that too ! but still thanks 

can u make it more simpler !

I am not sure what your question is. However:

The round bracket means the -2 is not actually included and the square bracket means that it is included.

Like

$$-2

Yes Rosala, but there is nothing to download.

Okay Rosala,  

I really like you to ask questions like this.

The son's age is X    That is correct.

The father's age is X+25

We need to know how old Sunny is when his father is EXACTLY DOUBLE sunny's age.

Exactly double sonny's age is 2X

So we need to know when

2X=X+25     (Twice son's age = father's age)

Think about it and then tell me if it helps.

by the way thanks melody to answer ! its a very good answer but i have a lil doubt ! thanks and thumbs up from me for the very nice answer !

i dont know why im getting a bit confused ! if the sons age is x then why did u do it like this 2x=x+25

just tell mee about 2x ?

Hi Rosala,

Sunny is now and always will be 32-7=25 years older than his son.

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so  if the son's age is X    (in any given year)

is Sunny's age is X+25

Sunny will be twice as old as his son when

2X=X+25

2X-X=25

X=25

25-7=18  This will happen in 18 years time.

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You could do this more simple.

The difference in age is 25years so when the son is 25 the father must be 50. (that is twice as much)

The boy is 7 now.  25-7=18

So this will happen in 18 years time!

reinout-g i think he means this website !

sorry everyone its not "don " its son in place of it !

32-34=A, A+1=B, B squared equals z, what is z.A.B

A=32-34=-2

B=A+1= -2+1=-1

z=B sqared = (-1)*(-1)=1

z * A * B = -2*-1*1 = 2

Do you mean 114 000 000 - 35% of 114 000 000

Well  35% of 114 000 000 = 35/100*114000000

$${\frac{{\mathtt{35}}}{{\mathtt{100}}}}{\mathtt{\,\times\,}}{\mathtt{114\,000\,000}} = {\mathtt{39\,900\,000}}$$

And  114 000 000-39 900 000=

$${\mathtt{114\,000\,000}}{\mathtt{\,-\,}}{\mathtt{39\,900\,000}} = {\mathtt{74\,100\,000}}$$

I don't know what you mean but there are 8 lots of 15 seconds in 2 minutes.

I am not very familiar with this type of question but I think it is just

$$(x,y)\rightarrow (x-7,y-4)$$

I always find it easier if I write the second one like this   $$y+4=(x+7)^2$$

Look at the graphs.  That will help too.

Answer is 2

35% of what?