Westonci.ca is your go-to source for answers, with a community ready to provide accurate and timely information. Connect with a community of experts ready to help you find accurate solutions to your questions quickly and efficiently. Explore comprehensive solutions to your questions from a wide range of professionals on our user-friendly platform.
Sagot :
To find the third term in the geometric sequence [tex]\( f(n) = 2 \cdot (0.8)^{n-1} \)[/tex], follow these steps:
1. Identify the general form of the geometric sequence:
[tex]\[ f(n) = a \cdot r^{n-1} \][/tex]
where [tex]\( a \)[/tex] is the first term, [tex]\( r \)[/tex] is the common ratio, and [tex]\( n \)[/tex] is the term number.
2. Given the sequence, [tex]\( a = 2 \)[/tex] and [tex]\( r = 0.8 \)[/tex].
3. We are asked to find the third term ([tex]\( n = 3 \)[/tex]). Substitute [tex]\( n = 3 \)[/tex] into the general form of the sequence:
[tex]\[ f(3) = 2 \cdot (0.8)^{3-1} \][/tex]
4. Simplify the exponent [tex]\( 3-1 \)[/tex]:
[tex]\[ f(3) = 2 \cdot (0.8)^2 \][/tex]
5. Calculate [tex]\( (0.8)^2 \)[/tex]:
[tex]\[ (0.8)^2 = 0.64 \][/tex]
6. Multiply [tex]\( 2 \)[/tex] by [tex]\( 0.64 \)[/tex]:
[tex]\[ f(3) = 2 \cdot 0.64 = 1.28 \][/tex]
The third term in the geometric sequence [tex]\( f(n) = 2 \cdot (0.8)^{n-1} \)[/tex] is [tex]\( 1.28 \)[/tex].
Therefore, the answer is [tex]\(\boxed{1.28}\)[/tex].
1. Identify the general form of the geometric sequence:
[tex]\[ f(n) = a \cdot r^{n-1} \][/tex]
where [tex]\( a \)[/tex] is the first term, [tex]\( r \)[/tex] is the common ratio, and [tex]\( n \)[/tex] is the term number.
2. Given the sequence, [tex]\( a = 2 \)[/tex] and [tex]\( r = 0.8 \)[/tex].
3. We are asked to find the third term ([tex]\( n = 3 \)[/tex]). Substitute [tex]\( n = 3 \)[/tex] into the general form of the sequence:
[tex]\[ f(3) = 2 \cdot (0.8)^{3-1} \][/tex]
4. Simplify the exponent [tex]\( 3-1 \)[/tex]:
[tex]\[ f(3) = 2 \cdot (0.8)^2 \][/tex]
5. Calculate [tex]\( (0.8)^2 \)[/tex]:
[tex]\[ (0.8)^2 = 0.64 \][/tex]
6. Multiply [tex]\( 2 \)[/tex] by [tex]\( 0.64 \)[/tex]:
[tex]\[ f(3) = 2 \cdot 0.64 = 1.28 \][/tex]
The third term in the geometric sequence [tex]\( f(n) = 2 \cdot (0.8)^{n-1} \)[/tex] is [tex]\( 1.28 \)[/tex].
Therefore, the answer is [tex]\(\boxed{1.28}\)[/tex].
Thanks for using our service. We aim to provide the most accurate answers for all your queries. Visit us again for more insights. Thank you for choosing our platform. We're dedicated to providing the best answers for all your questions. Visit us again. We're glad you chose Westonci.ca. Revisit us for updated answers from our knowledgeable team.