3 years ago

80 + ? + -30 = 0 whats in the middle

1 answer:

6 0

Answer: The answer is -50

because 80 + -50 = 30 and 30 + -30= 0 .

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$f(x)=4\cos(2x)+3$

Step-by-step explanation:

Using the general equation $f(x)=a\cos(bx+c)+d$ , we already know that $a=4$ and $d=3$ , but we need to find $b$ from the period:

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