In 1991 only 238 people owned cell phones in metropolis each year cell phone use has continually grown by 86℅ how many cell phones users were there in 2002

To find the answer, you would make an equation. P = Number of people owning cell phones in metropolis during 2002

p=238*1.86^11

The answer is 219,391

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.