Answer:
x = 8
Step-by-step explanation:
Equilateral triangle : congruent angles
3(7x+4) = 180
21x + 12 = 180
21x = 180-12
x = 168/21
x = 8
The answer is B, rational numbers :)
To solve the inequality:

Add 1 to the sides of the inequality:

Then

Dividing all the inequality by 5, we have:

Graphically:
Or, in the interval notation(-1, 1/5).