Official October ACT Math Thread - Page 2

nardi925 · 10-24-2009, 02:03 PM

all sounds good to me...
How about the A B C D one, which one doesn't always equal the other...i can't remember what the specific answer was but i think the multiple choice response was B?

Hopeful_Underdog · 10-24-2009, 02:03 PM

I agree with 88, 5/2, and s+t/sqrt(rs)... I thought that coordinate one was (-2,3)... I could very well be remembering incorrectly though. But I just kept the y value and made the x value negative.

ftmpooper · 10-24-2009, 02:05 PM

88? really? fml
A=B
c=square root of B
A cannot equal C

charlieharper · 10-24-2009, 02:06 PM

underdog, i think you forgot about the 90 degree part, which means the new slope would be the opposite reciprocal. so you switch the x and y and make the x negative. the actual answer is (-3, 2)

charlieharper · 10-24-2009, 02:07 PM

Anyone get 24 for the perimeter of the rhombus? i just multiplied the two diagonals and divided by two

rawkfist · 10-24-2009, 02:07 PM

s+t/sqrt(rs <--------------- which answer lette was it?
5/2<------------- which answer letter too?

charlieharper · 10-24-2009, 02:08 PM

the s+t choice was K i believe, and i dont remember the other one sorry =(

needtogetin · 10-24-2009, 02:11 PM

was 7.5 the answer for the point B reflected across the line of the midpoints?

akvk66 · 10-24-2009, 02:14 PM

was the tent one 5? i had a feeling i was doing something wrong on that.

Shark75 · 10-24-2009, 02:14 PM

^ yep. That's what I got. 7.5

Hopeful_Underdog · 10-24-2009, 02:15 PM

Same here. 7.5.

needtogetin · 10-24-2009, 02:16 PM

The tent was 5. It was 3^2 + x^2 = 6^2. So it's x = rad27 which is closest to 5. I hoping for a 36 on math

Hopeful_Underdog · 10-24-2009, 02:17 PM

"underdog, i think you forgot about the 90 degree part, which means the new slope would be the opposite reciprocal. so you switch the x and y and make the x negative. the actual answer is (-3, 2)"

--Your right, darn. Do you remember what the other answer choices were? I definitely chose a coordinate that was a negative x and a positive y. If (-3,2) was the only one that fits that description, then maybe I got lucky.

spectravoid · 10-24-2009, 02:17 PM

The question with the rectangle and said to reflect B over the line that makes a midpoint

was it 7.5??

Hopeful_Underdog · 10-24-2009, 02:18 PM

spectravoid- yeah I think it was 7.5.

Does anyone remember the answer choices for the coordinate one rotated 90 degrees?