Albeno69 (stupid) further questions!

[naved_s9994]

I've found a great way to distinguish between the dependant and independant variable is to construct a sentence from it, and see which option makes more logical sense. For example, Height and Time. The two sentences would be either 1) Height is dependant on time or 2) Time is dependant on height. The 2nd sentence doesn't make sense at all, while the first one is completely logical, so therefore, height is the dependant variable, and time is the independant variable.

Exactly, how I do it..
If youve enough Methods questiones, you should pick this up preety easily, by reading it..
Its always in the wording...very easy. just read and interpret - just practice, youll get better

[Albeno69]

I've found a great way to distinguish between the dependant and independant variable is to construct a sentence from it, and see which option makes more logical sense. For example, Height and Time. The two sentences would be either 1) Height is dependant on time or 2) Time is dependant on height. The 2nd sentence doesn't make sense at all, while the first one is completely logical, so therefore, height is the dependant variable, and time is the independant variable.

Exactly, how I do it..
If youve enough Methods questiones, you should pick this up preety easily, by reading it..
Its always in the wording...very easy. just read and interpret - just practice, youll get better

yea that what i have been doing sac in 2 weeks

[Albeno69]

Another question
how do i work out question 2 AND 6.
we did this last yr and i didn't have to much trouble but i lost all the notes i made for it and ones in text book are not realy good/helpful. It on page 21 of the pdf.

[Gloamglozer]

Another question
how do i work out question 2 AND 6.
we did this last yr and i didn't have to much trouble but i lost all the notes i made for it and ones in text book are not realy good/helpful. It on page 21 of the pdf.

I can't seem to open to attachment.  It says the file "...is damaged and cannot be repaired."

[Albeno69]

Another question
how do i work out question 2 AND 6.
we did this last yr and i didn't have to much trouble but i lost all the notes i made for it and ones in text book are not realy good/helpful. It on page 21 of the pdf.

I can't seem to open to attachment.  It says the file "...is damaged and cannot be repaired."

sorry bout that dont know what happened this one works.

[Albeno69]

Another question
how do i work out question 2 AND 6.
we did this last yr and i didn't have to much trouble but i lost all the notes i made for it and ones in text book are not realy good/helpful. It on page 21 of the pdf.

anyone know how to work these quetions out need some help.

[Gloamglozer]

2.  Firstly, let's find the volume because that's the easiest.  As it is a triangular prism, we know the formula for volume is:







Now, let's find the surface area.  If you look at the picture, there are 3 rectangles and two triangles.  We can now work out the surface area by splitting up each surface up, calculate the area of each side and add them all up.  That makes the formula:










6.  With this question, you are asked to calculate the volume of a right pyramid.  If you look on page 379, it will have the formula for a square pyramid, which is:



where x is the length of the base and h is the height.

In this question, as it is not a square pyramid, the logic still applies.  Instead of squaring the base, you just multiple the two sides of the base (ie. find the area of the base).  In fact, if you think about it, with a square pyramid, we are still multiplying the two sides of the base.  But because a square has sides of equal length, it will just be , which is of course, .

As this question is just a matter of plugging in numbers, I'll leave this one up to you and if you have any problems, just yell out. 

[Albeno69]

2.  Firstly, let's find the volume because that's the easiest.  As it is a triangular prism, we know the formula for volume is:







Now, let's find the surface area.  If you look at the picture, there are 3 rectangles and two triangles.  We can now work out the surface area by splitting up each surface up, calculate the area of each side and add them all up.  That makes the formula:










6.  With this question, you are asked to calculate the volume of a right pyramid.  If you look on page 379, it will have the formula for a square pyramid, which is:



where x is the length of the base and h is the height.

In this question, as it is not a square pyramid, the logic still applies.  Instead of squaring the base, you just multiple the two sides of the base (ie. find the area of the base).  In fact, if you think about it, with a square pyramid, we are still multiplying the two sides of the base.  But because a square has sides of equal length, it will just be , which is of course, .

As this question is just a matter of plugging in numbers, I'll leave this one up to you and if you have any problems, just yell out.  

ok for question 2 how did u know the height was 4?
and thanks

[Gloamglozer]

ok for question 2 how did u know the height was 4?
and thanks

In the question, we are told that the cross-section is a "right-angled isosceles triangle".  This means we can look at it like this:

[Albeno69]

ok for question 2 how did u know the height was 4?
and thanks

In the question, we are told that the cross-section is a "right-angled isosceles triangle".  This means we can look at it like this:

(Image removed from quote.)

thanks i was thinking that but realy wanst sure thanks very much.

[Albeno69]

another question cant seem to work out the answer for question 7 from exercise 13B anser from back of the book says,
7= 35.6 m
thanks

[stonecold]

solution is attached.

[Albeno69]

solution is attached.

thanks

[Albeno69]

another question,
when do u apply the ambiguous case i know it means there are two angle but not sure how to know when to apply the ambiguous case.

[Albeno69]

i am just writing my notes and i have noticed that the annuities formula in the quest and the essential are different could anyone tell me the correct formula for annuities.
Also business maths question,
How do you work out a question were either the interest rate has increase or decreased using the financial solver.