we have three tomatoe plants ,all doing the same thing

we have three tomatoe plants ,all doing the same thing
Planted tomato plants a week ago. Looked nice to start but now getting yellow leaves and wondering why?
The plant is about 4 1/2 feet now. At first slow to grow, but got some plant food for it and thrives on it. Noticed yellow like flowers at the top in clusters with buds in the middle. Are these tomatoes getting ready to bloom? This is great to hear. I actually have a green [...]