\[\sum_{n=1}^{7} 2(-2)^{n-1}\]
Answer:
c
Step-by-step explanation:


Answer:
69
Step-by-step explanation:
Gia already used 1/4. 3/4 divided by 5 = 3/20
Investment: cost of her education + salary as sales clerk during two years
Investment = 18,000 (2) + 20,000 = 36,000 + 20,000 = 56,000
Time to recover investment = 56,000/35,000 = 1.6
In less than two years, after she starts to work Niah will have recoverd her investment.