SAT数学备考经典模拟题训练13

>>SAT数学模拟题：SAT数学备考经典模拟题训练13

>>SAT考试辅导

5. -20 , -16 , -12 , -8 ....

In the sequence above, each term after the first is 4 greater than the preceding term. Which of the following could not be a term in the sequence?

A. 0

B. 200

C. 440

D. 668

E. 762

6. If f(x) = x² – 3, where x is an integer, which of the following could be a value of f(x)?

I 6

II 0

III -6

5.Correct Answer: E

Explanation:

All terms in the sequence will be multiples of 4.

762 is not a multiple of 4

6.Correct Answer: A

Explanation:

Choice I is correct because f(x) = 6 when x=3

Choice II is incorrect because to make f(x) = 0, x² would have to be 3. But 3 is not the square of an integer.

Choice III is incorrect because to make f(x) = 0, x² would have to be –3 but squares cannot be negative.

(The minimum value for x2 is zero; hence, the minimum value for f(x) = -3)

A. I only

B. I and II only

C. II and III only

D. I and III only

E. I, II and III

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