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College Discussion / College Admissions and Search / SAT and ACT Tests & Test Preparation / SAT Preparation

College Confidential’s “Dean,” Sally Rubenstone, put together 25 of her best tips. Get your free copy of the "25 Tips from the Dean" eBook and get helpful advice on how to choose a college, get in, and pay for it: http://goo.gl/9zDJTM

Arachnotron
Posts: **1,761**Registered User Senior Member

Give me any SAT Reasoning Test math question (or a question from a simulated practice test) and I'll post a solution. Specify detail (just the math work or explicit reasoning or w/e) if you want. I'll post ridiculously detailed solutions by default.

Post edited by Arachnotron on

## Replies to: Math help center

914Registered User Member#5 pg. 472 of Blue Book

#6 pg. 472 of BB

#8 pg. 473 of BB

2,604Registered User Senior Member1. http://img16.imageshack.us/img16/3329/q34g.jpg

2. http://img193.imageshack.us/img193/9058/78224058.jpg

3. http://img195.imageshack.us/img195/6129/52012792.jpg

Thanks.

1,761Registered User Senior MemberImage 1:

#15:

Since OD bisects <AOF, you know that m<AOD = m<DOF, and since you know that OC bisects <AOE, that m<AOB + m<BOC = m<COD + m<DOE, and since OB bisects <AOD, you know that m<BOC + m<COD = x = 40

Now since m<BOC + m<COD = 40, and since we know that OD bisects <AOF, we know that

40 + m<BOC + m<COD = 30 + m<DOE. Substituting, it is easy to see that the expression boils down to 40 + 40 = 30 + m<DOE, which gives that m<DOE is 50.

Finally, we want to find <BOE, which we can do by adding m<BOC + m<COD + m<DOE, which from the information we have derived simplifies to 40 + 50 =

90#17:

Since we remove every 4 inches, it is useful to find out how many triangles we will remove. This can be found by: 80/4 = 20. Then, notice that for every 1 inch you remove, you gain back 2 inches. So we gain back 20(2-1) = 20 inches, which would make our total length

100.1,761Registered User Senior Member#20

You know that the total rope length will be y + 4x, so the insight needed is an expression of y in terms of x. Luckily, we have area which gives xy = 4000. Now, rearranging, we see that x = 4000/y, which we can substitute into our expression to yield 16000/y, choice

B1,761Registered User Senior Member#7

Sum of the arc measures is 2pi or 360 degrees. It's divided into 5 equal segments. ABC gets two of these segments, which leaves 3 of these segments to AEC. Thus ratio of ABC to AEC is 2:3, choice

B.2,604Registered User Senior Member1,761Registered User Senior Member1,761Registered User Senior Member3,256Registered User Senior Member1,761Registered User Senior Member3,256Registered User Senior Member1,761Registered User Senior Member33Registered User Junior Member1,761Registered User Senior MemberTom's rate: 100 ft/27 sec

Bill's rate: 90 ft/27 sec.

(27sec/90ft)(100ft) = 30 seconds.

33Registered User Junior Memberfilling entries of an initially empty 2008