<h2>Hey mate,</h2><h3>I have attached the answer below</h3><h3>Hope it will help you...</h3>
The slope of a line is a measure of its steepness. Mathematically, slope is calculated as "rise over run" (change in y divided by change in x).

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The answer is A) <span>Increasing: x < 7; decreasing: x > 7</span>
Let's check.
x = 5π/24
4x = 5π/6
cos 4x = cos(5π/6) = cos 150° = -√3/2
cos² 4x = (-√3/2)^2 = 3/4
4 cos² 4x -3 = 4 (3/4) - 3 = 0
Answer: TRUE