Maria says that all the numbers in the nineties are composite. jackie says a number in the nineties is a prime. who has the reason? explain your answer.

this is my brothers homework and i don't really get it. it was translated to english from spanish and i would like some so that i can him. explain

I think that Maria would most likely be correct because the number 9 itself is composite, meaning that it can be divided evenly with numbers other than itself and 1.  But in fact, not all number in the nineties are composite. There is only one number in the nineties that is prime. That number is 97. 
So with that said, once again, I think that Maria is mostly correct, but not all numbers in the nineties are composite. Almost all numbers in the nineties are.

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle