Math Game - Check it out!

[Curveball]

Originally posted by GTJugend
b. 66 2/3 eggs

You're right. I finally did the math.

 

[the_cobbinator]

Here's one.

Tanker A and B are leaving on a 900 mi. journey to Corpus Christi. Tanker A can travel at 18 mph and Tanker B can go at 22 mph. However Tanker B is delayed 5 hrs. At what time will Tanker B pass Tanker A?

 

[hanker]

my quick guess will be at the 900 mile marker, which is 35.9 hours.............am i right?

 

[Klostrophobic]

At the 495 mile marker.

 

[hanker]

and how did you figure that one out, i want to see all calculations

 

[Klostrophobic]

I set up a proportion.
(22)/(18)=(x+5)/(x)
18x+90=22x
x=22.5

So Tanker B traveled for 22.5 hours and tanker A traveled for 27.5 hours.

I guess the correct answer is: at the 27.5 hour mark.

 

[Curveball]

My guess is 24.75 hours.

 

[the_cobbinator]

I'll give you a hint, it's easiest to set up a parametric equation.

 

[the_cobbinator]

Klostrophobic wins!

This was a hw problem that I found difficult, so I thought I'd post it up to see what others thought.

I used my handy TI-83+ and set up a parametric equation:

X1T=18T
Y1T=1
X2T=22(T-5)
Y2T=2

Then I traced the line until they were at same times and distances, the final answer being 495 ft.

 

[Klostrophobic]

I don't even know what a parametric equation is! My way is easier because it uses very simple algebra.

I'll ask an easy question.

What letter represents the square root of negative one?

 

[Curveball]

Originally posted by Klostrophobic
I don't even know what a parametric equation is! My way is easier because it uses very simple algebra.

I'll ask an easy question.

What letter represents the square root of negative one?

Negative one is not a perfect square. I'll guess n.

 

[Max Powers]

That's easy, i.

 

[Klostrophobic]

So now you go.

 

[Max Powers]

I'm gonna pass it on to whoever feels up for asking one.

I just took my ACTs this morning, and I've had enough math for a Saturday.

 

[Curveball]

An easy one:

1/2(5x+6)=8

 

[Jpec07]

.5(5x + 6) = 8
2.5x + 3 = 8
2.5x=5
x=2

 

[hanker]

X=2

 

[Klostrophobic]

x=2

I'm taking my SATs on Novermber 1. Hopefully I'll do well.

 

[hanker]

damn you beat me, while i was figuring it out

 

[Curveball]

You guys are right.

 

[Jpec07]

This one needs a bit of graphing, but here goes:

Solve the system (find where the lines meet):
y=14x^2+7x+7
y=24x^2+12x-8

 

[koolsax]

y = 14x^2 + 7x + 7
y = 24x^2 + 12X - 8

-7 = 12(14x^2 + 7x)
8 = -7(24x^2 + 12x)

-7 = 168x^2 + 84x
8 = -168x^2 -84x

Added together...
1 = 0
So...
No Solution

 

[the_cobbinator]

I graphed it and came up with (1, 28) so that'll have to be my answer.

 

[Jpec07]

I can only give you a 50% complete answer on that one, cobbinator, there's just more to it...

 

[skylineGTR_guy]

OMG the world is screwed and gone to hell....your doing MATH...for FUN...am i the only sane person here?
what level are you limiting the math to? I mean I could solve one then give you Vector-valued functions of several variables...then we would be here for years solving crap....

 

[Mike Rotch]

Originally posted by skylineGTR_guy
OMG the world is screwed and gone to hell....your doing MATH...for FUN...am i the only sane person here?

Whats wrong with that? I do my taxes for fun. Although, what has been in the preceding posts is not strictly maths, but rather algebra.

Patience! The pole up me'a*** will be removed soon via caesarian.

 

[Jpec07]

just you people wait until I get into 3-dimensional graphing Things shoudl really start to turn up when that happens...

 

[Super-Supra]

a puck is shot at a speed of 140km/h. How long would the golie have to ract if the puck is shot from 15 m in front of the net?

 

[Cobraboy]

Just under half a second.

Can't be ****ed showing my working.

 

[Super-Supra]

Originally posted by Cobraboy
Just under half a second.

Can't be ****ed showing my working.

Good Job Cobraboy!

The correct answer was a 0.3 seconds.