Al P. answered • 01/30/18

Online Mathematics tutor

1. a[n] = -7+4(n-1) = -11+4n; n=1,2,3,...

a[20] = -11+4(20) =

**69**2. a[n] = 15-2n; n=1,2,3,...

a[20] = 15-2(20) =

**-25**Matthew A.

asked • 01/30/18 1. -7,-3,1,5. 2. 13,11,9,7,

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Al P. answered • 01/30/18

Online Mathematics tutor

1. a[n] = -7+4(n-1) = -11+4n; n=1,2,3,...

a[20] = -11+4(20) = **69**

2. a[n] = 15-2n; n=1,2,3,...

a[20] = 15-2(20) =** -25 **

Kenneth S. answered • 01/30/18

Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018

the pattern # 1 is addition of four to each prior term to get next term; in # 2 it's subtracting 2 to advance to the next term each time.

You have to study these sequences and think about what's going on. By applying your mind and your time, you will gain experience & confidence.

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