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Mariulka [41]
3 years ago
8

Find r for the geometric series s5=244 a1=4 and a5=324

Mathematics
1 answer:
GaryK [48]3 years ago
8 0

Answer:

-3

Step-by-step explanation:

an = a1·r^(n-1) . . . . . . general term of a geometric sequence

a5 = 324 = 4·r(5-1) . . . specifically, the 5th term

81 = r^4 . . . . . . . . . . . divide by 4

Since the sum of 5 terms is less than the 5th term, the value of r must be negative:

r=-\sqrt[4]{81}=-3

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Answer:

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Step-by-step explanation:

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What does it mean if the hundred digit of my number is less than tens digit. The ones digit is greater than the tens digit. What
leonid [27]
Every number consists of digits which have their own value. If the number consists of 3 digits, then the rightmost digit is for ones, middle digit is for tens and leftmost digit is for hundreds (it goes on and on with more-than-3-digit-numbers). About your task:

Hundred digit is smaller than tens digit and tens digit is smaller than ones digit. It means that the leftmost digit is the lowest, the rightmost digit is the greatest and the middle digit is a value between both of them.

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3 0
3 years ago
Find the value of 7 + 32 (-5 + 1) ÷ 2.<br> A. 25<br> B. 32<br> C. -11
kobusy [5.1K]

Answer:

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Step-by-step explanation:

The expression shown evaluates as ...

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_____

If we assume your "32" is supposed to be 3², or 3^2, then the expression evaluates differently:

  7 +3²(-5 +1)/2 = 7 + 9(-4)/2 = 7 -36/2 = 7 -18 = -11 . . . . matches choice C

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When in doubt, you can have the Google calculator evaluate your expression. However, you do have to write it properly and with all the required parentheses.

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3 years ago
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