Consider abc with the measure of angle b equal to 60 degrees, and side lengths a=4 and c=5. which option lists an expression that is equivalent to the length of side b?

Step-by-step explanation:

(The choices are attached)

We don't if the triangle ABC is a right triangle of other kind, that's why we need to use the cosines law which is defined as

Where and , replacing these values we have

Remember that

Therefore, the second choice is the correct answer

answer: plz put a pic in so i can answer it

step-by-step explanation:

i would be happy to . most people on would also love to i'm sure. if you just want someone who has done algebra before and want a little more personal relationship than just begging strangers for , i can certainly be of service. i do have college myself so i might not be 24/7.