I'm going to get a test tomorrow on this and ion know how to do these

What value of x will make the triangles similar by the sss similarity theorem?

Mr. and mrs. wallace have decided to buy a car for $21,600. they finance $15,000 of it with a 5-year auto loan at 2.9% arp. what will be their monthly payment be? a. $268.20 b. $268.86 c. $269.54 d. $387.16 i need !

Pls brainliest will be awarded if answer is correct