SAT Questions

I don’t care which are best are which aren’t, but can anyone name the different companies or names that are put on a lot of the books that are for SAT, SAT II, AP preparation, and college information?

I know of some, such as Barron’s, Collegeboard, Cliff’s, and the "Crack the [fill in the blank]" series, but what are others? Thanks.
which are best <i>and</i> which aren’t (told you my brain isn’t working)
i guess html doesn’t work here ><

You don’t have to answer every one of them, even just one is fine, any help is appreciated, but a brief explanation is always good

Thanks.

1. If the ratio of a to b is 2 to 5, and the ratio of b to c is 1 to 4, what is the ratio of a to c?

A. 1:2
B. 1:10
C. 5:8
D. 5:4
E. 5:2

2. If y^(3/4) = 5^3, y = ?

A. 625
B. 250
C. 125
D. 25
E. 5

3, Both c and d are positive numbers, If (x-d)/(cx) = 5/2, what is the value of x in terms of c and d?

A. 10(5-d) c
B. 10(5 d) – c
C. 5cd
D. (-2d)/(5c-2)
E. (2d)/(5c-2)

4. if f(x) = (x^2 – 4) / (x^2 – 7x 12), what is one number NOT in the domain of f(x)?

5. If (2a – z) / (z a) = b, what is z in terms of a and b?

A. (2a – ab)/(b 1)
B. (3a)/(b)
C. (2-ab)/(b)
D. (a)/(b 1)
E. (2-b)/(2a)

6. If a/b = 7/4 and b/c = 8/6 then a/c =

A. 3/7
B. 4/7
C. 16/21
D. 21/16
E. 7/3

7. If a = b^(2/3) and b = c^(-2), what is the value of a in terms of c?

A. cubert(c^3)
B. 1/(cubert(c^4)
C. -cubert(c^4)
D. 4/c^3
E. -4/cubert(c^3)

8. If r = 2s^3 / t, what happens to the value of t when both r and s are doubled?

A. t is halved
B. t is doubled
C. t is tripled
D. t is multipied by 4
E. t is multiplied by 8

9. Given a sequence of integers where every third ter is a multiple of 3 and every second term is a multiple of 2, which of the following could be the value of the 144th term in the sequence.

A. 15
B. 44
C. 81
D. 114
E. 206

10. The number of instances of illness that a person in one year is inversly proportional to the average (art mean) number of hours that a person of 8 hours per night and was ill 3 times if she had slept an average of 6 per night?

A. 2.25
B. 3
C. 3.5
D. 4
E. 4.75

11. If x^2 =< 25 and y^2 >= 16, what is the least possible value of (x-y)^2

12. If f(x) = x^2 1, which of the following could NOT be the value of f(x)?

A. 0
B. 1
C. 2
D. 3
E. 4

Last one.
13. Currently a car has a chalk mark at the exact top of one of it’s front tires. The chalk will ear off after the chalk mark touches the ground 20 times, which is after the car travels 370.5pi inches. What is the current number of inches between the chalk mark and the ground?

depending on if I clicked the right answer or one of the wrong ones- it tells me??? Does this sound familiar to anyone?? My friend has it, but she’s not emailing me back… Thanks <<33