Law of cosines . 2 questions. serious only. (will report if needed)
1. what is the length of ab, to the nearest tenth of a meter?

4.4 m

6.5 m

8.6 m

8.9 m

2. what is the length of ef?
enter your answer as a decimal in the box. round only your final answer to the nearest tenth.

ft

my answer is$ 12

step-by-step explanation:

because 15 -2=12

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b