Answer:
see explanation
Step-by-step explanation:
using the identity
cos2a = 2cos²a - 1 , then
cos2a
= 2[ (a +
) ]² - 1
= 2 [ (a² +
+ 2) ] - 1
= (a² +
) + 1 - 1
= (a² +
) ← thus verified
A desk is purchased for $277. Calculate it's worth after depreciating for 5 years if it's depreciation rate is 20% per year
1 answer:
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Answer:
He bough 1.25 lbs of shrimp and 3.75 lbs of potato.
Step-by-step explanation:
Since the stew is composed of shrimps and potatoes, then the sum of the weighs of these ingredients must be equal to the weigh of the stew, so we have:
We also know that he bought three times more potatoes than shrimps, therefore:
Using the second equation on the first one, we have:
He bough 1.25 lbs of shrimp and 3.75 lbs of potato.