Digital ACT Math Practice Question #2126
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
Maximum occurs when subtracting a negative: $4 - 7(-1) = 11$.
The cosine function oscillates between $-1$ and $+1$: $-1 \le \cos(3x) \le 1$. To maximize $4 - 7\cos(3x)$, we need $\cos(3x)$ to take its minimum value of $-1$: $f_{max} = 4 - 7(-1) = 4 + 7 = 11$....
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