Answer:
15
Step-by-step explanation:
If CD and DE equal, then x+6 = 4x -21
So if you subtract x from both sides and plus 21 to both sides, that would be 3x = 27. Divide by 3 on both sides and you get 9.
Plug in x+6 with 9 and you get 15.
Answer: Arithmetic Sequence
Step-by-step explanation:
An Arithmetic Sequence is a sequence where each term increases by adding/subtracting some constant k. This is in contrast to a geometric sequence where each term increases by dividing/multiplying some constant k.
Answer:
x=0.333
Step-by-step explanation:
12(3x)=12
36x=12
/36 on both sides
x=0.333
Answer:
a mile
Step-by-step explanation:
Sophia walked 
of a mile
Layla walked 
of a mile
Layla walked more of a mile than Sophia
Hello
by identity : a²-b² = (a-b)(a+b)
m²-25 = m²-5² (m-5)(m+5)
