This one is A composite number
To make a square for x²+bx=c, add(

)²on both side
in this case, b is-3/4, half of b is -3/8, and (-3/8)² is 9/64, so you add 9/64 to both side.
Answer would be c to this question
Answer:
105°
Step-by-step explanation:
25+50+x=180
75+x=180
x=105