Answer:
25
Step-by-step explanation:
ABC is a right angle so ABD and DBC are <em>complementary angles</em> and their sum is equal to 90:
x + 55 = 90 subtract 55 from both sides
x = 25
Start by combining like terms:


Now we have:

Divide both sides by 2 to isolate s

Final answer:
s=12
Answer:
Not
Step-by-step explanation:
There cannot be the same two inputs and have different outputs
Substitute the x for 5, so your equation would be 2(5)-4