SC mathematics Marathon (2 Viewers)

[dionb2014]

In 42 minutes though.

 

[RivalryofTroll]

Just tried to do the 2009 exam as fast as I could.

Finished it in 21 minutes and 50 seconds. Scored 95%. lols

>>
Way too fast, but in the real thing you have to wait for the allocated time for section 1 to finish xD

 

[dionb2014]

I'm so pumped for Tuesday. Does anyone know the times of the exams or is it different from school to school.

 

[RealiseNothing]

I'm so pumped for Tuesday. Does anyone know the times of the exams or is it different from school to school.

Pretty sure the times are the same everywhere. Mine are at 9 or 9:30 I think.

 

[dionb2014]

It would make sense that they are at the same time because If I was first I could text you the hardest question to think about it for longer than everyone else realisenothing.

 

[Sy123]

Im not sure if this is SC worthy but...

Explain why tan90 is undefined (i.e. plug into calculator it becomes a math error)

If not then Ill try something safer with this.

(1). The shorter my hair is the faster is will grow, likewise the longer my hair is the slower it will grow. If there was a curve to describe my hair growth, describe the gradient of the curve.

OR

(2). True/False
a. A rhombus is a square
b. A square is a rhombus

(3). 3+5*9+(4-2)= ?

 

[RealiseNothing]

Im not sure if this is SC worthy but...

Explain why tan90 is undefined (i.e. plug into calculator it becomes a math error)

If not then Ill try something safer with this.

(1). The shorter my hair is the faster is will grow, likewise the longer my hair is the slower it will grow. If there was a curve to describe my hair growth, describe the gradient of the curve.

OR

(2). True/False
a. A rhombus is a square
b. A square is a rhombus

(3). 3+5*9+(4-2)= ?

tan90 is undefined as on a graph it runs 0, and since tan=gradient=rise/run, tan90 needs to divide by 0, which is undefined.

 

[dionb2014]

1) the gradient of the line goes from very step and then tepers off to a lower gradient as your hair gets longer.
2)A square is a rhombus but a rhombus is not a square.
3)50

 

[dionb2014]

5% of a people are flying first class
15% Are flying business class
the rest of the plane is economy class
Is 240 people flew economy class, how many flew business class?

 

[Sy123]

Awesome and all correct:
How about another question:

I have two lines:

y=ax
y=2x

The lines intersect at the origin, what values for a are there?
NOTE: This question is more simpler than you might think

 

[Deliriously]

ax=2x
x(a-2)=0
x=0 and 2 ?

 

[RealiseNothing]

5% of a people are flying first class
15% Are flying business class
the rest of the plane is economy class
Is 240 people flew economy class, how many flew business class?

45

 

[Sy123]

ax=2x
x(a-2)=0
x=0 and 2 ?

The graphs y=ax and y=2x ALWAYS intersect at the origin

So, a can be all values except 0

 

[dionb2014]

Y=5000x does not intercept the origin. I agree with 2, 0

 

[Sy123]

Y=5000x does not intercept the origin. I agree with 2, 0

http://www.wolframalpha.com/input/?i=y=5000x

Yes it does, and so does every other value for a, in fact I retract my statement
It is for ALL a, even y=0 intersects with y=2x at the origin.

The fact is no matter what value a is the constant will always remain 0. So it will not vary in it's x or y intercept

 

[dionb2014]

Sorry I am mistaken, when y=2x intersects at the origin I can use that to solve. At least if I get that question I won't get it Wrong now.

 

[Deliriously]

Awesome and all correct:
How about another question:

I have two lines:

y=ax
y=2x

The lines intersect at the origin, what values for a are there?
NOTE: This question is more simpler than you might think

i think that is the question and yeah it is for all values of x.
i think he wrote
"I have two lines:

y=ax
y=2x"
to trick you

 

[dionb2014]

He damn succeeded at it. I was trying to solve the equations for the lines simultaneously to derive values for x.

 

[bleakarcher]

5% of a people are flying first class
15% Are flying business class
the rest of the plane is economy class
Is 240 people flew economy class, how many flew business class?

Total number of people flying=240/(100-15-5)*100=300 people
Hence, 0.15*300=45 people flew business class

 

[dionb2014]

Sorry values for a