3 years ago

PLZ HELP ME STUCK AND NEED HETLP ASAP

Mathematics

1 answer:

dem82 [27]3 years ago

4 0

If I'm not mistaken, then the answer must be the last option.

Hope I understood correctly for your sake.

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Find mZB. Round to the nearest degree. 11 B В 7. 15

34kurt

Answer:

m∠B = 111º

Step-by-step explanation:

use law of cosines

c² = a² + b² - 2ab*cosC

---------------------------------

15² = 7² + 11² - 2(7)(11)cosB

225 = 49 + 121 - 154cosB

225 = 170 - 154cosB

Subtract 170 form both sides

55 = -154cosB

Divide both sides by -154

-0.3571428571 = cosB

m∠B = arccos -0.3571428571

use calculator

m∠B = 110.924832425009406

Rounded

m∠B = 111º

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