Select the angle that correctly completes the law of cosines for this triangle. 72 + 252 - 2 (7) (25) cos ___ = 242 A. 180° B. 90° C. 16° D. 74°

x = 76.45 degrees

Step-by-step explanation:

72 + 252 - 2 (7) (25) cos _x__=242

combine like terms

324-350cosx = 242

subtract 324 from each side

-350x = - 82

divide by - 350

cos x = - 82/-350

cos x = 82/350

take the arccos of each side

arccos (cos x) = arccos (82/350)

x = 76.45 degrees