andrew bought 3 baseball cards for $240.  after a few months, he got an offer from his friend jack to buy the first card for double its original value, along with either the second or third card.  andrew decided to sell the first card (at double its original value) along with the second card (at its original price) and got $320 for it.  or, selling the first card (at double its original value) card along with the third card (at its original price) would have only got him $280.  what were the original prices for each of the 3 baseball cards? (80, 120, 40)(80, 130, 30)(130, 90, 20)(120, 80, 40)

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )

$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