XP Math Games Arcade

**Sillysidley** · 06-22-2007

Hows about we start having a problem marathon? Someone posts a problem, and another person answers. Whoever answers needs to post a new one. Don't let the problems go to trig or proofs, or anything harder than middle school. I'll start.

What's the area of a right triangle with sides 3,4, and 5?

Edit: You can only post A new problem after your answer is verified as correct by the poster.

**Scion** · 06-22-2007

the answer is 6

solve $4x^2+5x-9=0$

**Sillysidley** · 06-22-2007

Quadratic Formula gives $x=1,-\frac{9}{4}$

Find the discriminant of the quadratic equation $2x^{2}+10x+8$ .

**Scion** · 06-22-2007

u mean discriminant right?

**Sillysidley** · 06-22-2007

Whoops, yeah. I had to hurry up, since my parents were calling me.

**Scion** · 06-22-2007

answer is 6 again lolz
find the area of circle with radius of 5.

**Sillysidley** · 06-22-2007

Incorrect.

**Scion** · 06-22-2007

**Sillysidley** · 06-22-2007

Yes, it's just supposed to be $b^2-4ac$ not $\sqrt{b^2-4ac}$

For your question, it's $25\pi$

Let someone else answer this, it's easy: What's the probability of drawing a yellow coin out of a bag with 4 yellow coins and 5 blue coins?

06-22-2007

$\frac{4}{9}$

What is $(x+y)^6$ ?

06-22-2007	#1
Sillysidley Join Date: Oct 2006 Posts: 822	Mathcounts Marathon Hows about we start having a problem marathon? Someone posts a problem, and another person answers. Whoever answers needs to post a new one. Don't let the problems go to trig or proofs, or anything harder than middle school. I'll start. What's the area of a right triangle with sides 3,4, and 5? Edit: You can only post A new problem after your answer is verified as correct by the poster. __________________ . Last edited by Scion; 08-23-2007 at 08:55 PM.. Reason: new rule

06-22-2007	#2
Scion Join Date: Nov 2006 Posts: 437	the answer is 6 solve $4x^2+5x-9=0$ __________________

06-22-2007	#3
Sillysidley Join Date: Oct 2006 Posts: 822	Quadratic Formula gives $x=1,-\frac{9}{4}$ Find the discriminant of the quadratic equation $2x^{2}+10x+8$ . __________________ . Last edited by Sillysidley; 06-22-2007 at 04:44 PM..

06-22-2007	#4
Scion Join Date: Nov 2006 Posts: 437	u mean discriminant right? __________________

06-22-2007	#5
Sillysidley Join Date: Oct 2006 Posts: 822	Whoops, yeah. I had to hurry up, since my parents were calling me. __________________ .