Question

HELPPPP WITH MATH QUESTION

Answer 1

Answer:I think its the third answer

Answer 2

The correct answer is B.

Step-by-step explanation

The cosine rule can be used to find the relation for b.

According to the cosine rule:

`{b}^(2) = {a}^(2) + {c}^(2) - 2ac \cos( B )`We have that a=4 and c=5 and B=60°

We plug in these values to get:

`{b}^(2) = {4}^(2) + {5}^(2) - 2(4)(5) \cos( 60 \degree )`

`{b}^(2) = 16+ 25 - 40 ( (1)/(2) )`

`{b}^(2) = 16+ 25 - 20`

Take positive square root.

`b = √(25 + 16 - 20)`

The correct answer is B