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Question 4 (5 points) Listen A man, who is 6-ft tall, is walking towards a(n) 18-ft tall streetlight at a rate of 3.5 ft/sec. At what rate is the length of his shadow changing when he is 21 ft from the light? Show all your work on your paper. Be sure to include units in your answer on paper. In D2L, enter your final answer as a decimal rounded to 2 decimal places. X y