There is no difference in pronunciation of the letter. The stress is on the last syllable for “está” (verb) while usually the stress falls on the second to last syllable. You should still be able to tell which is which since a verb is obviously used differently in a sentence than an adjective or pronoun.
Sometimes, there is an accent even though the stress is in the ordinary second to last syllable, like for “árbol”, but also beware of one syllable words with an accent which indicate a different meaning of the word than its unaccented version and which sound exactly the same.
“tú” = “you”, but “tu” = “your“
“él” = “he”, but “el” = “the”
There are more, so check at this site:
esta = this (demonstrative adjective for a feminine noun)
está = verb form used for "él" or "ella" to mean " is", but also used for Spain's formal you "usted" which would then be translated as " are".
The verb "estar" means " to be", but it is used differently than "ser". PLACE: position, location, action, condition, emotion Where you are and how you are, use estar. https://www.thoughtco.com/verbs-meaning-to-be-ser-estar-3078314
The word "está" is a verb like "es" which both mean "is" for 3rd person singular pronouns, but here you have the word "esta" which means "this" and the verb in this sentence is "tiene". The verb has an accent, but the demonstrative adjective does not have an accent.
By the way, the permanent (es) vs. temporary (está) does not work for everything. Read the following to learn when to use each verb:
Here is more information about demonstrative adjectives:
Well, 3 in English = 3 in Spanish, but it would be a different symbol in Chinese for example. This course is linked to the English from Spanish course where they will want to teach that "tres" = "three". You could try reporting it as also correct and they may add it sentence by sentence, but write it out to always be correct.