Antonio and abby had the same number of paperclips. after antonio gave 30 paperclips to abby. abby had twice as many paperclips as antonio. how many paperclips did they have in all?
(draw before and after model. start with 3 units each)

180 paperclips.

Step-by-step explanation:

Let be "x" the number of paperclips Antonio had and "y" the number of paperclips Abby had.

We know that Antonio and Abby had the same number of paperclips. This can be expressed as:

After Antonio gave 30 paperclips to Abby, she had twice as many paperclips as Antonio. This is:

Substitute the first equation  into the second equation and solve for "y":

Since both had the same number of paperclips, we must multiply the value obtained by 2 in order to find the number paperclips they had in all.

Then:

$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