Alma, There are many reasons why you tomato leaves can curl or roll including insects, stress, disease, and herbicide poisoning. Check out this PDF from Texas A&M AgriLife Extension to see if you can identify the problem: What Makes Tomato Leaves Twist or Curl?

I usually amend the soil in fall and if the manure isn’t quite as aged as I would like it to be, I’ve found that adding rock dust and gypsum helps prevent blossom end rot on my tomatoes and squashes.

For the really hot days here in Utah, I plant the tomatoes where they will get some shade in the afternoon to help them pull through.

Maria, Yes, tomatoes will grow in hot temperatures. The point I made is the fruit stops ripening when it is warmer than 85˚F. The lycopene and carotene pigments can’t form at high temperatures. Why Aren’t My Tomatoes Ripening