X+y = 15
x-y = 25
------------
2x = 40
x = 40/2
x = 20
y = 15-x
y = 15-20
y = -5
2x² - y² =
2*20² - (-5)² =
2*400 - 25 =
800 - 25 =
775
All the angles in a triangle equal 180 degrees so 128 + (5x+10) + 9x = 180
Group the like values to get 138 + 14x = 180
Subtract 138 from 180 to get 14x = 42
Divide 42 by 14 to get x = 3
Therefore x = 3
Answer:
r=d/2=18/2=9cm
circumference=2πr=2×3.14×9=56.52cm
Answer:
Step-by-step explanation:
common difference is 6
