What is the answer to these problems

Programming
Tutor: None Selected Time limit: 1 Day

Find a6 when a1=13,d=4

Find a150 when a1=60,d=5

May 25th, 2015

an=a1+(n-1)d

So 

a6=a1+(6-1)d

---> a6=13+5*4=33

--->a6=33

and 

a150=a1+(150-1)d

---> a150=60+(150-1)5

--->a150=805

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May 25th, 2015

What is the answer to this problem 

Find the sum of the first 25 terms of the arithmetic sequence: 7,19,31,43

May 25th, 2015


Use the above formula, put  

n=25 

d=19-7=12

a1=7

May 25th, 2015

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