It is <span>B</span>. All u have to do is -2a/b which is 2 then plug 2 in and you get (2,1)
Answer:
or .
Step-by-step explanation:
How are tangents and secants related to sines and cosines?
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Sticking to either cosine or sine might help simplify the calculation. By the Pythagorean Theorem, . Therefore, for the square of tangents,
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This equation will thus become:
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To simplify the calculations, replace all with another variable. For example, let . Keep in mind that .
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Solve this equation for :
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Given that , is the only possible solution.
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, where (i.e., is an integer.)
Given that ,
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or . Accordingly,
or .
Just add the two numbers and divide them by two
Let x be the amount invested at 7%, leaving 30000-x to be invested at 9%.
The equation is
2320 = 0.07 x + 0.09 (30000 - x)
2320 = -0.02 x + .09(30000)
0.02 x = .09(30000) - 2320
x = ( .09(30000) - 2320) / .02
x = 19000
Answer: $19000 at 7%, $11000 at 9%
Check:
19000(.07)+11000(.09) = 2320, good