You should get Angelias quick American cook book.
Yes--just use a sheet cake pan that is the same area as the pans on the box. If it is a larger pan, you may have to do some math.
The proper temperature to bake any cake depends on the specific recipe and the size pan being used. Follow the directions on the cake mix package or listed in the recipe.
There are several different recipes and types of no-bake fruit cake, but in general, they should be refrigerated. In many no-bake desserts, the ingredients will not hold together indefinitely at room temperature.
375 degrees
Yes, but you will then need to bake it for a longer amount of time.
Sheetcake pans come in a variety of sizes and depths. What size you want to use depends on the number of servings you want. Also, make sure the pan will fit in your oven. Not all full sheet cake pans fit in all ovens.
You would use a cake pan shaped like a guitar, or bake a large sheet cake, and cut it into shapes then assembled and frosted to look like a guitar.
All you have to do is pour the cake batter into the cake pan and cook it in the oven according to the time and temperature that the recipe specifies.
In a 12" x 17" pan? Don't do it, that will overflow. You can barely bake two boxes per sheet, it's nearly too much. As for the timing for two boxes, it's about 35-45 minutes at 325-350 degrees.
Cake rhymes with rake and you bake a cake.
If this question is talking about the temperature, it really depends on the cake, but it is usually 350°F/175°C/Gas Mark 4.