4. Which expression is a simplified form of -5(8x)? a. 40x b. -40% C. 3x d. -40x?
1 answer:
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Answer:
A
Step-by-step explanation:
We can write this as Sinx by "flipping" the .
So we will have:
From basic trigonometry, we know the value of of sine is of the angle
<em>But when is sine negative? </em>Either in 3rd or 4th quadrant. But the answer has to be between 0 and , <em>so we disregard 4th quadrant.</em>
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<em>To get the angle in 3rd quadrant, we add π to the acute angle of the first quadrant (which is π/4 in our case).</em><u><em> Thus we have:</em></u>
A is the right answer.
Answer:
Step-by-step explanation: