Answer:
x = 88.2
Step-by-step explanation:
The angle at the top of the triangle = 90° - 10° = 80°
and the left side of the triangle is x ( opposite sides of a rectangle )
Using the tangent ratio in the right triangle
tan80° =  =
 = 
Multiply both sides by x
x × tan80° = 500 ( divide both sides by tan80° )
x =  ≈ 88.2
 ≈ 88.2
 
        
             
        
        
        
Answer:
B
Step-by-step explanation:
x² - 4x - 7 = 0
(x - 2)² = 11
 
        
             
        
        
        
No, any integer is a rational number tho
        
             
        
        
        
Answer: -2
Step-by-step explanation:
you need to isolate x. 
to do that, you first add 2 to each side giving you 3x=-6
to isolate further, you divide both sides by 3 giving you -2