A 6ft tall observer is standing at the top of a cliff. He spots a house in the adjacent valley at an angle of depression of 12 degrees. The cliff is 54 ft tall. How far away is the house from the base of the cliff?

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The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z