Invitational Questions

Date: Feb 6, 2005

Invitational Questions

Date: Feb 8, 2005

hey vinay,

i don't know about the 1st problem, i don't know wut does the brackets mean either.

the 2nd problem i believe it should be 2*3*7, your are right about 84 = 2 * 2 * 3 * 7, but you repeated the 2, the answer should be 2*3*7, 42.

and i believe the 3rd problem is 15, because 2^4-1=15

how did you do on that invitational?

hope that helped

quincy

Date: Feb 8, 2005

Thanks quincy,

I did alright at the invitational. I got first place in the 9th and 10th grade division, but if they put all the high school grades together, I would've placed second.

At every invitational I've been to, the contestants have been grouped: 9th and 10th, 11th and 12th.

Are you sure grade level doesn't matter for UIL?

Vinay

Date: Feb 8, 2005

yeah i am pretty sure, at least it didn't matter last year

webmaster · Administrator

Hey guys,

Sorry I have been super busy and have had no time to even look at this site. I think the answer to the first questions is 2. Usually the brackets mean the smallest whole number less than the value in brackets.

Ex[1] [sqrt(5)] = 2 becasue the sqrt (5) is 2.something so the answer is 2.

Ex[3] [-3.14] = -4 because it is the smallest whole number less than -3.

You might want to check to make sure. What was the answer on that problem. Try to always give answers because it makes my job that much easier.

See ya

Date: Feb 9, 2005

Sorry,

I didn't have the answers. They wouldn't release them since the test is still in use.

Vinay

Mathman · Star Member

Regarding the problem with the brackets [ ],

To be exact, the brackets mean "greatest integer less than or equal to". So for example the answer to [-3.5] is -4 and the answer to [+3.5] is 3.

This forum is a great resouce - thanks to all who take the time to post questions and comments.

langris5 · Senior Member

mathman:

you competed for Lufkin? Wow...our team is waiting for the results for your school, becuz we are competing for the wildcard in calculator.

quincy

Sam · Star Member

Mathman, are you from Lufkin? That's very interesting. I'm from Nacogdoches.

-Sam

Mathman · Star Member

Yes I went to Lufkin High School (actually the old campus - now they have a relatively new school) so I am very familiar with Nacogdoches, which is just over 20 miles away from Lufkin. Good to hear that East Texas has a strong candidate this year so good luck to you.

I moved into Texas in the 10th grade & didn't know anything about Number Sense. My math teacher asked me to take a Number sense test one day & I scored something like a 21 (or was it a -21). I actually should have been scored much lower because I actually left red eraser marks on the test from where I had erased some of my "carry" marks! Ha!

Looking back I'm not surprised either at the score - it seems to me that people who are smart or think they are fast in math really don't develop a number "sense" on their own that lets them compete very well on these types of tests without learning the tricks.

Date: Apr 5, 2005

[n] means the greatest integer less than or equal to n. In the case of 62[sqrt 5], the greatest integer less than or equal to the square root of 5 is 2 since the square root of 5 is approximatley 2.2.

When they ask for the product of the prime factors of 84, you need to keep in mind that the prime factors of 84 are 2, 3 and 7, therefore 2(3)(7) is 42.

An n-element set has 2 to the n power number of subsets. The proper subsets are the subsets of the set, excluding the set itself. For example : A 4-element set has 2 to the 4 power subsets or 16 subsets. This set has 15 proper subsets.

Leo Ramirez
visit my website at www.rammaterials.com