I have different numbers for fertilization, 12-10-5 or 4-6-4. Will either one work for tomatoes and cucumbers?
It is best to test your soil to determine the amount and correct NPK fertilizer to apply to your soil.
You County Extension Office can help you with a soil test.
Here is a link to help you locate your closest office.
Here are some links with more information on fertilizer and plant care.