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:
(x + 5)(x + 4)
Step-by-step explanation:

Integers can only be whole numbers, so she should have said that negative WHOLE numbers are integers.
Answer:
73
Step-by-step explanation:
Put the values of the variables where the variables are, then do the arithmetic.
(2·5)^2 -3·3^2 = 10^2 -3·9 = 100 -27 = 73
___
Or, you can let a calculator or spreadsheet evaluate the function for you.
Answer:
1.) D
2.) 12in
3.)6
Step-by-step explanation: