Melody

I don't know what the cow would be... LOL... but

CosA= adj / hyp = 9/15

Maybe this will help you remember this:

Some old hags  : can't always hide : their old age

sin = opp / hyp : cos = adj / hyp    : tan = opp / adj

I tried to diplay this better but our display facilities are not working properly.

Do you understand how this is relevant?

Hi everyone,

There is no way I can go through all the questions and answers like I usually do. There are just too many.  I have ticked many of the questions that I think are fully answered.  I am reluctant to tick my own answers unless I think someone has checked and given me a thumbs up or written acknowledgement of my accuracy.  I think that you all have the ability to give a thumbs up or a thumbs down to any answer or question. 

I am also reluctant to finalise questions when the answers are over my head.  Unless another trusted answerer has checked (mainly for careless mistakes)

Andre has told me that he intends to eventually show the name of the last answerer - like how it used to be.  It will be easier to check answers then.  

Rom is back with us again, he said he thought the forum was down, the address is different now.  I am wondering if Samgelinas is absent for the same reason.  Can anyone contact him?  

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At the moment these are what I see as the biggest problems.  (I hope that Andre Massow is reading this)            

I know that some of you would have different priorities.

Think of a right angled triangle and label one of the acute angles $$\theta$$

$$tan\theta = \frac{opposite\:side}{adjacent\:side}$$ 

I am thinking about both of your answers.

Since the question talks about a radius it is fair to assume that the pentagon is inscribed in a circle.  That is, the 5 vertices must lie on the circumference of the circle.  However,  why have you both assumed that it is a regular pentagon.  I don't think that all the angles have to be 72 degrees.  BUT if it is not a regular pentagon then there is not enough information to get an answer.  On that basis, maybe your second assumption are not so unreasonable.

Would anyone like to comment?

Hi

There are some great answers here.

Bertie, you are a wealth of information. 3 14 Pi Day. WOW 

We don't celebrate pi day in Australia either.  Do the children in the U.S. get a day off school?  They should do don't you think?

Cotangent is 1/tangent

In a right-angled triangle it is adjacent side / opposite side (in relation to the given acute angle)

This is not an answer, it is a google translation from Malay.

Ini bukan jawapan, ia adalah terjemahan dari google Melayu.

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when 0.4 kg of metal is heated using a heater 1.2 kJ / s, entirely transformed into a mass of metal dilution in 2 minutes 5 s. During this time, the temperature remains constant at 650 degrees Celsius. Latent heat of the molten metal is ..

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I am assuming that you mean 4% per annum, that is 1% or 0.01 per quarter

FV=PV(1+i)ⁿ

1000=500(1+0.01)ⁿ

2=1.01ⁿ

log2 = log1.01ⁿ

log2 = nlog1.01

n=log2 / log1.01

n=69.66 quarters

time = 70/4 = 17.5 years

Thanks Rom,

If you are not at university then Rom's answer probably doesn't make any sense. (He is right though)

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So I will tell you that there are no solutions to this because you cannot find the square root of a negative number.

A negative x a negative = a positive

a positive x a positive = a positive

No (real) number times by itself = a negative : so there are no solutions.

Chris means

4(x-5) = 4*x - 4*5 = 4x-20

I'd show you a picture but we can't upload attachments at the moment (I don't think)