Reverse the sign of each term you are subtracting and then add as usual. Hope this helps!
An obtuse angle because an obtuse is an angle that is greater than 90 degrees but less than 180.
Answer:

Step-by-step explanation:
Hi there!

To get rid of the fraction
, multiply both sides of the equation by 3 (the denominator):

To get rid of the fraction
, multiply both sides of the equation by 5 (the denominator):

I hope this helps!