What expression? I don't see any
Answer:
23 years old
Step-by-step explanation:
Let x = age of younger sibling.
Then, the age of the older sibling is x + 9.
x + x + 9 = 55
2x = 46
x = 23
Answer: 23 years old
Answer:
A. 50 doses
Step-by-step explanation:
Take your total and divide by the about needed per dose.