Answer:
Triangles 3 and 4 are both isosceles. They each have a 60 degree angle. 
This is a similar triangle.
Step-by-step explanation:
Isosceles triangle is one in which two sides are equal. 
Similar triangles are triangles which have all corresponding angles equal and which have corresponding sides with the same ratio. 
Now the given isosceles triangle both have all three angles equal to 60 degrees which makes them similar triangles. 
The other choices given are not similar triangles because 
1) they do not have all corresponding angles equal
2) their lengths are unknown and cannot be assumed to be in ratio.
 
        
             
        
        
        
Answer:
Hello,
Answer C: -40
Step-by-step explanation:

 
        
             
        
        
        
A simple way to look at how to check for equivalent fractions<span> is to do what is called “cross-multiply”, which means multiple the numerator of one </span>fraction<span> by the denominator of the other </span>fraction. Then do the same thing in reverse. Now compare the two answers to see if they areequal<span>.</span>
        
             
        
        
        
Answer:
He bought 6 chairs and 10 tables.
Step-by-step explanation:
x+y = 16
he spent = $1800
1 chair = $50
y chairs = $50y
1 table = $150
x chairs = $150x
so, 150x+50y = 1800
we got two equations :
x+ y = 16
150x+50y = 1800
Using. substitution method,
x+y = 16
so, x = 16-y
Now
150x+50y =1800
or, 150(16-y) + 50y = 1800
or, 2400-150y+50y = 1800
or, 2400-1800 = 150y-50y
or, 600=100y
so, y = 6
now,
x+y = 16
or, x + 6 = 16
so, x = 10
 
        
             
        
        
        
The answer is 6 because 14+6=20
Hope this helps