Answer:
Your answer is correct. The series is a geometric series with common ratio -1/4 and first term 40. So each term is:
an = 40 (-1/4)^(n−1)
So the sum of the first 10 terms is:
∑(n=1 to 10) [ 40 (-1/4)^(n−1) ]
You want to get x on one side so you divide both sides by 7 and 35/7 = 5
Answer:
2^2 x 5 x 11
Step-by-step explanation:
Take out the common factor
