7 1/2 ummm i did it in my head lol but i’m sure it’s right
Answer:

Step-by-step explanation:
we have
-----> equation A
-----> equation B
Using a graphing tool-----> to resolve the system of equations
Remember that the solution of the system of equations is equal to the intersection point both graphs
see the attached figure
the solution is 
Answer:
x= 25
Step-by-step explanation:
There are 180 degrees in a triangle
100 + 55 + x = 180
155 + x = 180
Subtract 155 from 180
x = 25
Answer: 1.65
Step-by-step explanation: