Question: Maybe I'm foolish but if they're poor then how does Kate afford a nice looking car?
Answer: Just because someone is low income doesn't mean they can't own a decent car. Kate could spend what little money she has to pay for her car and still consider herself poor because she has no money left over after paying bills. Plenty of low income people still own decent cars because they are more reliable and require less maintenance than an older car, and are thus a good investment. Kate has three children, works two jobs, and goes to school. She has to have a good car to get back and forth and there's no way she could afford a major repair on an older car, so buying a new car is actually a smart choice for her situation.
Question: Why didn't Frank Welker reprise his role as the voice of Soundwave for this film?
Answer: I couldn't find any other information, but honestly... Soundwave is barely in the movie. Probably just wasn't worth it for the production to pay Welker to come in just to record a few throwaway lines.
I considered that possibility as well, but since Peter Cullen reprised his role as the voice of Optimus Prime yet again for this film despite Prime's minimal involvement, it doesn't quite wash. Also, given Frank Welker's highly prolific voice acting career, it's unlikely he would have declined on the basis of pay or importance of his involvement.
Soundwave was barely in the movie (he's literally only in a few shots) and only had one or two lines. As the other answer suggested, it probably just wasn't worth it for the studio to pay Welker to come in, or they just didn't feel it was necessary given that Soundwave was essentially just a blink-and-you'll-miss-it cameo. Optimus has a much larger presence, and Peter Cullen's voice is pretty synonymous with the character in the film series. Hence, it was worth it to have him return.
Answer: Absolutely. White Castle is credited as the first "fast food" chain in the United States. The company began its traditional brick and mortar, fast food burger operation in 1921 but had operated as a food cart company since 1916.
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