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Tomtit [17]
2 years ago
13

If y varies inversely with x and y = 5 when x = 4, which equation that relates x and y?

Mathematics
1 answer:
Bumek [7]2 years ago
7 0
X+4x-y5 is the wrong answer
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Given the function ƒ(x) = 20x2 − 18x − 25, find ƒ(−1).
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f(x) = 20x² - 18x - 25

f(-1) = 20(-1)² - 18(-1) - 25

= 20 + 18 - 25

= 13

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Can anyone help me with trig identities?
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Answer:

cosA = √(21/25)

Step-by-step explanation:

We know

sin²(A) + cos²(A) = 1

Next, we know that sin(A) = 2/5. Plugging that into our equation, we get

(2/5)² + cos²A = 1

4/25 + cos²A = 1

subtract 4/25 from both sides to isolate cos²A

cos²A = 1 - 4/25 = 25/25-4/25 = 21/25

square root both sides to get

cosA = √(21/25)

We do not include -√(21/25) in our possible answer for cosA because this is in quadrant 1, so cosA must be positive.

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