- What are the two perpose of acetic anhydride in the synthesis reaction of aspirin?

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Mathematical modeling help? A helicopter is rising at 5.0m/s when a cargo is dropped.The bag falls for 4.0s. A)What is the bag speed when it hits the ground?
B)How far? What are some ways to describe the makeup of an ecosystem? Write in the form Asin(Bt+theta) using sum or difference formulas? -2sin(7t)+3cos(7t)? What is the period of the wave motion for a wave with a frequency of 0.55 kHz?