Answer: x= 17°
Explanation:
The interior angle of a triangle adds up to 180 degrees. It indicates that it is a right triangle so it already has a 90 degree angle and if you add it to the two other angles they have to equal 180 degrees. 
(2x + 4 ) ( 3x + 1) + 90 = 180 
5x + 95 = 180 
 -95 -95 
5x = 85 
x = 17