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Mathematics

1 answer:

nikklg [1K]2 years ago

7 0

Answer:

Answer choice C) 3a-3

Step-by-step explanation:

Your perimeter is of (10a-6). The first step would be multiply 2a by 2 since you have to sides. Which would give you to 4a. Next you will have to subtract 4a from (10a-6). This would give you 6a-6. Finally divide by two and you will get 3a-3.

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Given a term and the common difference, find the explicit formula. 8. a(19) = 135 d = 15

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Solution:

Given, a term a(19) = 135 and common difference d = 15

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Now, we know that, a(n) = a + (n – 1)d where a(n) is nth term, a is first term, d is common difference,

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$\begin{array}{l}{\rightarrow a(19)=a+(19-1) 15} \\\\ {\rightarrow 135=a+18 \times 15} \\\\ {\rightarrow a=135-270} \\\\ {\rightarrow a=-135}\end{array}$