You buy a helmet that costs $22.95 with a 6.5% sales tax. What is the total cost of the helmet after tax?
2 answers:
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Using the Pythagorean identity, the value of the cosine ratio is
The given parameter is:
By the Pythagorean identity, we have:
So, we have:
This gives
Evaluate
Take LCM
This gives
Take the square root of both sides
Cosine is positive in the fourth quadrant.
So, we have:
Hence, the cosine value is
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