I'm sorry I can't answer this but the triangle looks like it's wearing a thong
The answer is to multiply
2x + 8.....factor = 2(x + 4)
JKL is similar to PQR
so they want PR
JK
L is similar to
PQ
R
So PR is similar to JL
And they also give us the sides KL and QR
J
KL is similar to P
QR
Both of those sides are similar, so we can form a proportion.

Plug in the numbers:

Cross multiply:

Isolate PR

Simplify it

So your final answer is
Since t=3
What do have to do is just set it for 3.
13(3) -2
k(3) = 37