Which of the following is an arithmetic sequence? 2, 4, 8, 16, 12, 4, 4/3, 16/3 1/2, -1/2, -3/2, -5/2 1/2, -1/2, 1/2, -1/2

an arithmetic series increases or decreases by a constant amount

its the third choice - in this case the common difference is -1.

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40

3, 12, 48, 384, 1536, 6144, 24576, 98304

step-by-step explanation:

just keep timing it by 4.