The events are independent because they are not affected by the other coin toss. Hope this helps^-^
Answer: C
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Subtract the payment from the previous balance:
4236.87 - 3200 = 1036.87
Now add his total purchases:
1036.87 + 989.42 = 2026.29
This is the total amount he owes, now subtract that from his credit line:
8500 - 2026.29 = 6473.71
His available credit is $6,473.71
Donald can feed 61 animals approximately
<em><u>Solution:</u></em>
Given that Donald has
pounds of grain to feed his farm animals
Each animal eats
of a pound of feed
<em><u>To find: number of animals he can feed</u></em>
From given information,
Total pounds of grains = 
One animal feeds = 
number of animals he can feed = Total pounds of grains divided by one animal feeds

Thus he can feed 61 animals approximately
(6+3i)(6-3i) =
(6 x 6) (6 x -3i) = 36 - 18i
(3i x 6) (3i x 3i) = 18i + 9i^2
36 - 18i + 18i + 9i^2
36 + 9i^2