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poreally1446
23.08.2019 •
Mathematics
Three consecutive even numbers have a sum where one half of that sum is between 90 and 105.
a)write an inequality to find the three numbers. let n represent the smallest even number.
b)solve the inequality
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Ответ:
(a)
(b)
Step-by-step explanation:
Given
The above sequence
Solving (a): The explicit formula
The given sequence is a geometric sequence because the common ratio (r) is:
The explicit formula is calculated using the n term of an GP.
Solving (b): Summation notation.
This implies that the sum of the sequence.
To do this, we write Tn inside the summation sign
i.e.
Substitute values for Tn