Answer:

Step-by-step explanation:






Answer:
5 pounds.
Step-by-step explanation:
2 1/2 = 2.5
2.5 x 2 = 5
Answer:
x = 21
Step-by-step explanation:
The 2 angles form a straight angle and are supplementary, thus
7x + 9 + 2x - 18 = 180, that is
9x - 9 = 180 ( add 9 to both sides )
9x = 189 ( divide both sides by 9 )
x = 21
Answer: the variable can not be replaced by any other number
Step-by-step explanation: