Which expression is equivalent to -11 - (-7)?

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Sasha delivers newspapers to subscribers that live within a 4 block radius of her house. sasha's house is located at point (0, -1). points a, b, c, d, and e represent the houses of some of the subscribers to the newspaper. to which houses does sasha deliver newspapers?

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