Answer:
D
Step-by-step explanation:
a - 3 = 7 ( add 3 to both sides )
a - 3 + 3 = 7 + 3 , that is
a = 10
Answer:
x = 40
Step-by-step explanation:
Using Pythagoras' identity in the right triangle
x² + 30² = 50²
x² + 900 = 2500 ( subtract 900 from both sides )
x² = 1600 ( take the square root of both sides )
x =
= 40
X + x + x + 20 + 10 = 180
(combine like terms)
3x + 30 = 180
3x=180-30
3x=150
x=150/3
x=50
Answer:
2
Step-by-step explanation:
Answer:
i belive it is 900
Step-by-step explanation:
(n-2)180
(7-2)180
(5)180
900