What is the equation of the midline for the function y=3cos (x-pi)-4

3 cos((x - π ) - 4 = 3 cos(x) - 4 since cos(x-π) = cos(x)  

-1 ≤ cos(x) ≤ 1  

-3 ≤ 3cos(x) ≤ 3  

-3-4 ≤ 3 cos(x)-4 ≤ 3-4  

-7 ≤ 3 cos(x) ≤ -1  

The range is -7 to -1 so the midpoint is (-7-1)/2 = -4  

y = -4 is the equation of the midline

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there you go

2nd one in the first row is correct

me! what did you put for this question?

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