Home->ACT Math

If a = 5 and b = -, which of the following expressions will be the greatest?

(A) a + b

(B) a - b

(C) a × b

(D) a ÷ b

(E) |a × b|

The second term of an arithmetic sequence is -2, and the third term is 8. What is the first term?

(Note: An arithmetic sequence has a common difference between consecutive terms.)

（A）-12 （B） -10 （C） （D） 3 （E） 10

Correct Answer: A

What is the value of 4 + 3^{x – y} when x = 3 and y = -1?

(F) 13 (G) 16 (H) 30 (J) 85 (K) 2,041

Correct Answer: J

What value must be added to 9x² - 30x in order to complete the square (that is, make it a perfect square trinomial)?

（A）-5 （B） 5 （C） 9 （D） 25 （E） 45

Correct Answer: D