I think it is the Associative Property of Addition.
Answer:
B. 
Step-by-step explanation:
Using Pythagorean theorem, find the value of x.
Pythagorean theorem is given as 
Where,
c is the longest side of a right angled ∆ = the hypotenuse = x
a and b are legs of the right angled ∆ = 2 and 6
Plug in the values into the equation and solve for x
Answer:
true
Step-by-step explanation:
1/10=0.1
0.1*2=0.2
Answer:
A = 22.5 m²
Step-by-step explanation:
longest side length
b = √((-7 + 4)² + (-1 - 8)²) = √90
other sides
a = √((-1 + 7)² + (2 + 1)²) = √45
height
h = √((√45)² - (½√90)²) = √22.5
Area of triangle
A = ½bh = ½√90√22.5 = 22.5 m²
a little math shows that this triangle is a tilted half of a square with sides √45
84
from 4 to 7 , they added 3
from 7 to 12 they added 5
from 12 to 19 they added 7
from 19 to 28 they added 9
3, 5, 7, 9.... They are simply adding odd numbers to each number. So after 9 would be 11, so you add 11 to 28 and get 39, and so on...
39 + 13= 52
52 + 15 = 67
67 + 17 = 84
84 is the ninth term, so that is your answer.
