need help with maths question! URGENT!

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Ok..

I've begun revising, as I'm going to re-do year 12, and I always struggled with maths, I used to be unable to focus, but I believe with a bit of effort and revising I can work it out.

Anyway don't make fun of me, I know its a really easy question, I just can't seem to remember one of the rules about fractions thats stopping me from working this one out..

5(y/6 - 2) = 2y + 4


I know the answer is -12 already, but I want to know how to get rid of the 6 below the y, I have a feeling its something really simple I'm overlooking..

Its because I was obsessed with words, biology, and a certain person throughout the last 3 years of high school, I'm paying for it now, but I've been working hard and have learnt a lot, now I'm onto the maths, my worst subject, but I'm actually gaining a fondness for it.

Please help me!

5(y/6 - 2) = 2y + 4

Multiply out bracket. 5y/6 -10 = 2y + 4
Multiply all terms by 6 5y -60 = 12y + 24
sort terms (by adding and subtracting equally) -84 = 7y

Thankyou.


So I generally want to eliminate brackets first.

Here is another ridiculous one, I can't believe it, I'm finding some much more complex ones easy, but some fundamental rules I've forgotten are stopping me in my tracks.


ab^2 . (ac)^2 + c(b-a)

a = 2

b = -3

c = -2

ok I replaced the numbers came out with this:

2.-3^2 . (2.-2)^2 + -2(-3-2)

so if I follow through:

2.-3^2. (-4)^2 + 10

then:

2 . 9 . 16 + 10

Which comes to an answer nothing near the 82 I'm supposed to get.

Once again I'm missing a very basic mathematics rule, I'm trying to memorise them all, I was going to head straight into applicable maths, but i might have to settle for intro and spend another whole year at the terrible way I'm going.

If you can explain it as thorough as possible that would help greatly.

The rule as we learned it here in the US is PPMDAS, or Please Pardon My Dear Aunt Sally.

Parenthesis
Powers
Multiplication
Division
Addition
Subtraction

This is the basic rule for the order in which to do operations in math problems such as these. (I'm pretty good at math and not getting anywhere near 82 either).

Hmmmn maybe theres a mistake in this one. In the question that is.

I briefly tried to back-engineer the right answer, but couldn't find a simple modification to the formula as written that would do it.

Its alright.

I've swallowed my pride, and decided to go back to school.

I'm doing year 11 + 12, I know 11 will be easy, but certain subjects I need the backing for the others.

I was so obsessed with keeping a certain girlfriend, and so obsessed with music, at school that I didn't focus AT ALL in years 11 and 12.

Now I'm finally driven again, I'm studying intro-cal, Geometry and Trigonometry, Chemistry, Physics and of course English.

I will have to focus, but from what I've worked on so far in all the topics, I shouldn't find it hard at all now that I'm interested, I seem to be able to excel at anything I put my mind to (like all of us I'm sure).

The goal being nanotechnology..

Its so strange, I remember hating school cause of all the people there, this time I'm actually quivering with excitement at the thought of studying.

What a geek!

Yeah any chemistry question you have feel free to ask me.

I had a nanotech idea a small hallow plastic sphere about the diameter of a red blood
cell it would have small pores about the diameter of a bacteria (much smaller than a
red blood cell). In side the sphere would be plated with silver. Silver is reported by
health nuts to kill micro-organism. It does but its quite toxic in the effective doses.
The holely sphere with interntal silver plate would allow the bacteria alot of contact with silver and protect blood cells from contact. In other words a way to take a high
dose of silver.

Note the trick is how do you make the spheres? I though of various photolitgraphic methods and means to purifer the spheres. The very act of puting some bacteria size
pores on the sphere would make them act as interference filters thus the sphere would
look colored! even though they would be made of clear plastic and mirror silver plate.

Thanks for the offer of help in chemistry, I just might need it we shall find out.



Silver is an interesting addition to the body.

I read about the desire to create ones that attach to cancer cells then destroy them.

Programmable virus?

Virus killer?

Intriguing.

Repeat.

The only way I see to get 82 from a similar formula is ab^2.c^2 + c(b-a)