First triangle:
2x+2x+x=180
x=36
second triangle:
7x+3x+90=180
x=9
third triangle:
2x+x+x=180
x=45
good luck!!
Answer:

Step-by-step explanation:
Let the missing integer be x
Solve for x

Move 3 to right hand side and change it's sign

The negative and positive integers are always subtracted but posses the sign of the bigger integer

Change the signs of both sides

Hope I helped!
Best regards! :D
Answer:

Step-by-step explanation:
If you divide
by 4 (both numerator and denominator)
You get
which is equivalent to the given ration
I’m not sure hmmm I think you multiply them after you find the answer to what’s inside the parentheses.