Which of the following is an arithmetic sequence? –20, –25, –30, –35, –45, –15.6, –12.9, –10.2, –7.5, –4.8, 3.1, 6.2, 12.4, 24.8, 49.6, 7.2, 3.6, 1.8, 0.9, 0.45,

The correct option is 2.

Step-by-step explanation:

A sequence is called arithmetic if it has common difference.

In sequence 1,

–20, –25, –30, –35, –45, ...

Therefore it is not an arithmetic sequence.

In sequence 2, the common difference is

Therefore it is an arithmetic sequence and option 2 is correct.

In sequence 3,

Therefore it is not an arithmetic sequence.

In sequence 4,

Therefore it is not an arithmetic sequence.

Therefore only option 2 represent arithmetic sequence.

answer: a

step-by-step explanation:

10.2 units

$4034.40

the perimeter of the field is the sum of the lengths of the four sides:

47 yd + 158 yd + 47 yd + 158 yd = 410 yd

the cost of 3 ft (1 yd) of fence is 3×$3.28 = $9.84.

so the cost of jake's wood perimeter fance is

(410 yd) × ($9.84 /yd) = $4034.40