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aliya0001 [1]
3 years ago
7

What is the general term equation, an, for the arithmetic sequence 5, 1, −3, −7, . . . , and what is the 21st term of this seque

nce?
Hint: an = a1 + d(n − 1), where a1 is the first term and d is the common difference.

an = 17 − 4n, a21 = −67
an = 17 + 4n, a21 = 101
an = 13 − 4n, a21 = −71
an = 9 − 4n, a21 = −75
Mathematics
1 answer:
coldgirl [10]3 years ago
8 0
The common difference, d, can be determined by subtracting the two consecutive values:

1 - 5 = -4
-3 - 1 = -4
-7 - -3 = -4

Then, using the equation:

an = a1+ d(n-1)
a_21 = 5 + (-4)(21 - 1)
a_21 = -75

The answer is letter D. I hope I was able to help you. Have a good day!
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(CO6) From a random sample of 68 businesses, it is found that the mean time that employees spend on personal issues each week is
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(1) (4.82, 4.98)

(2) Large sample size

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(4) (15.083, 15.117)

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(2) Error margin = (t-value × standard deviation)/√sample size

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(3) mean = 37.5, sd = 0.6, n= 100, degree of freedom = n-1 = 100-1 = 99

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