Trigonometric Equations Word Problems

A pharmacist is to prepare 15 militers of special eye drops for a glaucoma patient. The eyedrop solution must have a 2% active ingredient, but the pharmamcis only has 10% solution and 1% solution in stock. How much of each type of solution should be used to full the prescription?
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4th root of 3 times the 4th root of 3
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the decay rate of a certan chemical is 9.7%. What is its half life?
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There is a 50 ft. beam that has cast a shadow of 13 ft. across the ground, what is the angle at which the shadow was casted
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The depth of water at the end of a pier varies with the tides throughout the day.Today the high tide occurs at 2:17 a.m. with a depth of 9m. The low tide occurs at 8:31 a.m. with a depth of 3.5 m .If the tide ebb and flow over time in a periodic manner. Find a trignometric equation that models the depth of the water x hours after midnight
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