So, when solving this: you’ll want to consider multiples of 7 and 4.
7,14,21,28
4,8,12,16,20,24,28
If you write four +7’s and seven -4’s, they cancel out. Given that that is 11 digits, do it twice and you have your answer.
Eight +7’s
Fourteen -4’s
Answer:
4
Step-by-step explanation:
The first term is the value of the term when n=1. It is 3. The common ratio is is the value being raised to the power of (n-1). It is 1/4. Put these numbers into the formula and do the arithmetic
S = 3/(1 -1/4) = 3/(3/4) = 3·4/3 = 4
The sum is 4.
40 - 3k + 10k = -10 - 8k - 10
40 + 7k = -10 - 8k - 10
40 + 7k = -8k - 20
40 + 7k - 40 = -8k - 20 - 40
7k = -8k - 60
7k + 8k = -8k - 60 + 8k
15k = -60
15k/15 = -60/15
k = -4
Answer:
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Step-by-step explanation:
Answer:
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Step-by-step explanation:
