Find the sum.+15 + (-48)

A. -63
B. 63
C. -33
D. -64


Answer: C

Mathematics

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Find the solution of the differential equation , without solving it. ?

A. ?
B. ?
C. ?
D. ?
E. ?

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Complete the sentence so the result is an identity. Let x be any real number.   = 

A. sec x B. tan x C. csc x D. cot x

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For what values of x does the series converge absolutely?

A. x > 
B. -  < x < 
C. 0 < x < 
D. None

Mathematics

Solve the equation.(6.2)2 = (13.3)2 + (15.5)2 - 2(13.3)(15.5)cos ? for 0° < ? < 90°

A. 58.1 B.  25.3° C. 21.3° D. 23.3°

Mathematics