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Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6