Answer:
x = 10
Step-by-step explanation:
x = 4 + (4x-4) ^ (1/2)
 First, we rewrite the expression:
 x = 4 + (4x-4) ^ (1/2)
 x = 2 (2+ (x-1) ^ (1/2))
 x = 4 + 2 (x-1) ^ (1/2)
 From here we get a solution for x = 10
 To check it we substitute x = 10 in the expression:
 10 = 4 + 2 (10-1) ^ (1/2)
 10 = 4 + 2 (9) ^ (1/2)
 10 = 4 + 2 (3)
 10 = 4 + 6
 10 = 10
 Answer:
 The solution is:
 x = 10
 
        
                    
             
        
        
        
Answer:less than
Step-by-step explanation:
 
        
             
        
        
        
Answer:2
Step-by-step explanation;
 
        
                    
             
        
        
        
For numbers 15-17, we need to remember that two of a triangle's angles are always acute and the third angle will allow us to classify the triangle based on its angles. now that we know this, let's look at #15. the first two angles listed are acute, and the third is an obtuse angle, therefore it is an obtuse triangle. on #16 we have three acute angles, so it is an acute triangle. #17 has two acute angles and a right angle so it is a right triangle. 
on numbers 21-23, we need to know that a triangle with all congruent sides is called equilateral, a triangle with two equal sides is isosceles, and a triangle with no equal sides is called scalene. #21 shows two equal sides so it is an isosceles triangle. #22 has three equal sides so it is an equilateral triangle. #23 has no equal sides so it is scalene. hope this helped! :)