Triangle R S T is shown. The length of R S is 9, the length of S T is 8, and the length of R T is s. Angle R S T is 111 degrees.
Law of cosines: a2 = b2 + c2 – 2bccos(A)

What is the value of s to the nearest whole number?

10
12
13
14

both equations and proportions are better.

c

step-by-step explanation:

i think because what else can be a sample of every member

-8/2y-8=5/y+4-7y+8/y^2-16

we move all terms to the left:

-8/2y-8-(5/y+4-7y+8/y^2-16)=0

we can not solve this equation

inverse operation of addition