\[\sum_{n=1}^{7} 2(-2)^{n-1}\]
Answer:
280
Step-by-step explanation:
50% is half, so to get the total, multiply 140*2 which is 280.
It would be 20% because if you take 100 times 1/5, which is the same as 100/5, you would get 20, which is 1/5.
Answer:
16.5
Step-by-step explanation:
Answer:
x = 5
Step-by-step explanation:
