Answer:
B.) 5
Hope this helps :)
Step-by-step explanation:
5x - 4x + 3 = 4x - 12
x + 3 = 4x - 12
+12 +12
x + 15 = 4x
-x -x
15 = 3x
x = 5

The cosine function is negative in 2nd and 3rd quadrants, So you know that you will have 2 solutions. One between pi/2 and pi, the other between pi and 3pi/2.
Refer to a unit circle to find that

Final Answer:
Range is the y-values and since the arrows extend off the graph, we can assume it goes on forever so
answer: (-infinity,+infinity)
make sure it’s parenthesis, not brackets
30 60 90 right triangle on the right
ratio of short leg: long leg :hypo = a: a√3: 2a
So if hypo = 52 cm then short leg = 52/2 = 26 cm
The other right triangle on the left is 45 45 90 because it has 2 equal sides
ratio of leg: leg :hypo = a: a: a√2
the leg = 26 cm
so hypo x = 26√2
Answer
26√2 cm