PLEASE ANSWER QUICK! WILL MARK
Triangle ABC has angle measures as shown.
What is the value of X?
Show your work

X= 13. One angle is 90° and a triangle has 18o degrees so 3x+4x-1=90 and u can simply it to 7x-1=90 then 7x=91
And divide bush sides by 7 and get x=13

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