MATHS MARATHON! (Mathsathon?) (2 Viewers)

[mastistar]

CD = 12

BC = 10

right?

here is my working out

AB : AC = 1 : 3 so 5 : 15 so minus AB from AC and we get 10.

as AB : AC = 1 : 3...we can say that BE : BC = 1: 3..so on

iunno if iam right.

 

[zavier]

CD = 12

BC = 10

right?

Correct!
Still doing that simultaneous equation one. Sorry. I almost got it!


Maureen was born on 26 November 1990. What was her age on 26 August 2004?
(A) 13 years 8 months (B) 13 years 9 months
(C) 14 years 8 months (D) 14 years 9 months

 

[Mudkip94]

Find the shortest distance between (2,5) and the line y = 2x - 3.

 

[mastistar]

Correct!
Still doing that simultaneous equation one. Sorry. I almost got it!


Maureen was born on 26 November 1990. What was her age on 26 August 2004?
(A) 13 years 8 months (B) 13 years 9 months
(C) 14 years 8 months (D) 14 years 9 months

its b..kinda ez.

 

[Mudkip94]

correct!
Still doing that simultaneous equation one. Sorry. I almost got it!


Maureen was born on 26 november 1990. What was her age on 26 august 2004?
(a) 13 years 8 months (b) 13 years 9 months
(c) 14 years 8 months (d) 14 years 9 months

b.

 

[jesskies]

Maureen was born on 26 November 1990. What was her age on 26 August 2004?
(A) 13 years 8 months (B) 13 years 9 months
(C) 14 years 8 months (D) 14 years 9 months

B.
13 years because it isn't a full year, and the remaining months is 9 until her birthday.

 

[mastistar]

Find the shortest distance between (2,5) and the line y = 2x - 3.

I dun understand the question..can u do this for me plz...I suck with these linear equations >.>.


question:

Carl was asked to add 19/20 and 14/15. Before using his calculator, Carl estimated that he answer should be close to 2.Explain how Carl could have done this by estimation.

 

[Entity]

I dun understand the question..can u do this for me plz...I suck with these linear equations >.>.


question:

Carl was asked to add 19/20 and 14/15. Before using his calculator, Carl estimated that he answer should be close to 2.Explain how Carl could have done this by estimation.

Multiply 19/20 buy 3, and 14/15 by 4.

57/60 + 56/60

113/60 which equals approx. 2


Donna is paid an hourly rate based on a 38-hour week and recieves time-and-a-half for any hours worked overtime. Last week she worked 44 hours and was paid $2219.34

What was Donna's normal hourly rate?

A) $47.22 B) $50.44 C) $54.13 D) 58.40

 

[zavier]

CD = 12

BC = 10

right?

here is my working out

AB : AC = 1 : 3 so 5 : 15 so minus AB from AC and we get 10.

as AB : AC = 1 : 3...we can say that BE : BC = 1: 3..so on

iunno if iam right.

HERE, I found this... (work backwards)
A father is nine times the age of his son. In 5 years time, he will be four times the age of his son. How old are they now?

present:
father = 4*son
(father-5) = 9*(son-5)

9*father=36*son
4*(father-5) = 36*(son-5)

4*father - 20 = 36*son - 180
4*father - 20 = (9*father) - 180

160 = 5*father

father = 32
son = 8

5 years ago:
father = 27
son = 3

 

[mastistar]

HERE, I found this... (work backwards)
A father is nine times the age of his son. In 5 years time, he will be four times the age of his son. How old are they now?

present:
father = 4*son
(father-5) = 9*(son-5)

9*father=36*son
4*(father-5) = 36*(son-5)

4*father - 20 = 36*son - 180
4*father - 20 = (9*father) - 180

160 = 5*father

father = 32
son = 8

5 years ago:
father = 27
son = 3

9*father=36*son
4*(father-5) = 36*(son-5)

how did u think of 9 and 36?...like did u go wats *4 = 36?

 

[Mudkip94]

I dun understand the question..can u do this for me plz...I suck with these linear equations >.>.

d = |ax₁ +by₁ +c|/root(a² +b²)

d = |2 * 2 -1 * 5 -3|/root(2² + (-1)²)

d = |-4|/root(5)

d = 4 root(5)/5

 

[mastistar]

d = |ax₁ +by₁ +c|/root(a² +b²)

d = |2 * 2 -1 * 5 -3|/root(2² + (-1)²)

d = |-4|/root(5)

d = 4 root(5)/5

omfg..thats some hard maths.. i dun even think thoese kind of questions will be in the Sc..Is this question from past papers?

 

[zavier]

9*father=36*son
4*(father-5) = 36*(son-5)

how did u think of 9 and 36?...like did u go wats *4 = 36?

Here you are:
A father is nine times the age of his son. In 5 years time, he will be four times the age of his son....? - Yahoo! Answers
I asked on Y!A and the first answer is pretty good. Will probs get more answers, just watch it.

Next question (easy one):
Peta sells cars. She earns $270 per week plus 5% commission on her total weekly
sales over $40 000.
What is the value of her sales in a week when she earns $860?
(A) $11 800
(B) $17 200
(C) $51 800
(D) $57 200

 

[sfernando]

guys can anyne help me find the answer of 1.8/0.03 ( without using a calculator)???

 

[Mudkip94]

omfg..thats some hard maths.. i dun even think thoese kind of questions will be in the Sc..Is this question from past papers?

Nah, it's a 2U/3U HSC question. I just asked it to sound smart

 

[Mudkip94]

guys can anyne help me find the answer of 1.8/0.03 ( without using a calculator)???

1.8/0.03 = 180/3 = 60

 

[karanrlz]

1.8=9/5
0.03=3/100

so it'd be 9/5 *divided by* 3/100
and so u flip the second equation over and times across
so you'd get 9/5 * 100/3
times across=900/15
15 into 90=6 so therefore, 15 into 900=60 (since you added an extra 0 on 1 side, you gotta add it on the other side or something along those lines)

well thas how i'd do it, hope it helped

okkk i just found out a MUCH easier way for this :L, thnx for the help mudkip LOL

 

[brent012]

nvm...

 

[mastistar]

Nah, it's a 2U/3U HSC question. I just asked it to sound smart

lolz funny kient.

Here you are:
A father is nine times the age of his son. In 5 years time, he will be four times the age of his son....? - Yahoo! Answers
I asked on Y!A and the first answer is pretty good. Will probs get more answers, just watch it.

have any idea how he got his first step frm?
(9s + 5)/(s + 5) = 4

 

[brent012]

lolz funny kient.




have any idea how he got his first step frm?
(9s + 5)/(s + 5) = 4

(9 times the age of the son)+5 divided by sons age +5.
Makes perfect sense.