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# Math question Help

Registered User Posts: 115 Junior Member
edited August 2011
I have forgotten how to do this. I recall the formula, but we went over it a week before the final so I was not paying 100% attention to learning it as I was to getting all the information I accumulated back and ready for the exams. something like

N(term)=N+1(something) and there are different ways to manipulate the formula, but I am guessing you only need basic sequence knowledge for the SAT. I am only concerned with getting a better SAT score right now.

In a certain sequence where the numbers are increasing, the difference between consecutive terms is always the same. If the fourth term in the sequence is 19 and the eleventh term is 47, what is the first term in the sequence?

(A) 1
(B) 3
(C) 7
(D) 8
(E) 11

won't give away answer so you guys have some fun without spoiling it
Post edited by Working2college on
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## Replies to: Math question Help

• Registered User Posts: 115 Junior Member
If a not equal to 0 and 5 over x = (5 + a) over (x + a), what is the value of x?

(A) negative 5
(B) negative 1
(C) 1
(D) 2
(E) 5

another one for you..answer for first one later though :)
• Registered User Posts: 379 Member
do you want the answers ???? there pretty easy :D
• Registered User Posts: 115 Junior Member
Figure
Note: Figure not drawn to scale.

The figure above shows a right circular cylindrical wheel of cheese 2 inches high from which a wedge weighing 1 over 2 pound has been cut. All cuts are perpendicular to the base and radiate from points B and C, the centers of the circular top and bottom. What is the weight, in pounds, of the original uncut wheel?

(A) 2
(B) 3
(C) 4
(D) 6
(E) 12

I'm sure some where there are these exact same questions.. I am doing an online skills insight on the collegeboard website.

but still

I do not understand this one either..guess i'm really rusty after the summer

the cut would be 30 degrees according to the figure not shown.. 30 out of 360 or 12% of the whole thing. But using 12% did not get the right answer for me so I am stuck
• Registered User Posts: 115 Junior Member
yea i would like the answers, and an explanation..the only thing these questions do not have is an explanation...

by the way, if you want to make fun of how easy they are. maybe you should use the right words to say so. They are or they're not 'there'
• Registered User Posts: 115 Junior Member
In the coordinate plane, the points F (negative 2 comma 1), G (1 comma 4), and H (4 comma 1) lie on a circle with center P. What are the coordinates of point P?

(A) (0 comma 0)
(B) (1 comma 1)
(C) (1 comma 2)
(D) (1 comma negative 2)
(E) (2.5 comma 2.5)

these have plagued me quite frequently.. If anybody has a quick answer to this, It would be much appreciated. In honors algebra 2 we went over this extensively but I have forgotten the formula. Besides, there has to be a quick way to answer these sort of problems at least one will be on the sat itself
• Registered User Posts: 379 Member
well i am not making fun i am really sorry if you misinterpreted me , my grammar skills are really rusty(always been) but i guess the first question is 7...... Is that the answer ????
• Registered User Posts: 379 Member
Guess 2nd one is 5...... Is this correct ?????
• Registered User Posts: 115 Junior Member
I thought you said you knew how to do them? oh well, yea I guess we both should relax a little

these are from the Skills Insight on the sat website, but without answer explanations to them

anybody with explanations is welcome to help out. Usually these type of questions tend to get answered quickly.

the first one is 7 and the other is 5 but how? I have seen some great explanations on this site and they always make other questions even easier. Help would be much appreciated
• Registered User Posts: 379 Member
well I took the fouth term 19 and eleventh term 47 then i made an equation 19+7x=47 I chose 7 because it is the difference between 4th and eleventh term (places) x=4 then I subtracted 19-12 as difference between 4th and 1th term is 3 places = 7
• Registered User Posts: 379 Member
(5/x)=(5+a)/(a+x) I multiplied 5 by a+x and x by 5+a,... 5a+5x=5x+ax 5x cancels out 5a=ax (a/a =1) 5=x
• Registered User Posts: 379 Member
3rd cant help you need to see diagram..... Im really bad at imagining diagrams
• Registered User Posts: 379 Member
4th is B .... Is this correct ??? Aint really sure working on another way to find the solution.
• Registered User Posts: 115 Junior Member
Thanks man, sorry for how the questions looked. I have trouble with screenshots, so I just C&P but it ends up changing what I write to a bit more confusing language.

I think the 4th on is B.
• Registered User Posts: 379 Member
no prb happens to me all the time(grammar idiot) do you want my reasoning on why 4th is B or do you have a good one???
• Registered User Posts: 115 Junior Member
here is another one that I found

The circumference, in inches, of a certain circle is C, where Absolute value (C minus 20.5) less than or equal to 0.5. Which of the following is a possible area of the circle, in square inches?

(A) 64 over pi
(B) 81 over pi
(C) 100 over pi
(D) 121 over pi
(E) 144 over pi

I did it this way, I figured that c= any number 20.5-21
c=2 pi R, so i divided by 2 pi the lowest and highest number to get a range of acceptable numbers

but I'm still sort of confused though, the correct answer is C 100/pi

guess i just needed to rethink it or something..i did not understand if what i did was right.

yea a refresher on how to do 4th one would be appreciated.
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