Answer:
3x=30
Step-by-step explanation:
3x=30
3x/3=30/3
x=10
 
        
             
        
        
        
Call the point of intersection of the diagonals point X.
Each base is the hypotenuse of an isosceles right triangle whose sides are the diagonals and whose 90° angle is at X. The altitude of that triangle (⊥ distance to the base from X) is half the length of the hypotenuse. Then the height of the trapezoid is half the sum of the base lengths.
The area of the trapezoid is the product of the height and half the sum of the base lengths, hence is the square of half the sum of the base lengths.
... Area = ((16 cm +30 cm)/2)² = (23 cm)² = 529 cm²
 
        
             
        
        
        
Answer:
y= 143°
x= 37°
Step-by-step explanation:
y is 143° cause they are the same thing just on the other side.
x us 37°cause 180-143 is 37.
 
        
             
        
        
        
Answer:
Solution is (2, -1)
Step-by-step explanation:
The lines cross  at the point where x = 2 and y = -1.
 
        
             
        
        
        
Answer:
(0, -4)
Step-by-step explanation:
I don't quite know how to explain it, but I was taught that the number in the equation that doesn't have a variable, in this case -4, is the y-intercept. The order pair is (0, -4) because a y-intercept is where the line crosses the y-axis and the y-axis is located on the 0 of the x-axis.