Write the expression in standard form. 3/3-12i

Assuming ya mean
and you want complex form as in a+bi 

remember that so
and remember conguates
we don't want imaginary numbers in the denomenator so

first sipmlify the farction

multiply it by
result is







in standard form (a+bi form) is

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