Posted by **bluebabe** on Tuesday, February 21, 2012 at 7:21pm.

if you evaluate the expression 5a-2 for a=1,2,3,4 and so on,you form a sequence of numbers.what is the sum of the first 10 numbers in the sequence you form by evaluating the expression for a=1 through 10? explain your reasoning

- math -
**Reiny**, Tuesday, February 21, 2012 at 8:27pm
you will get the numbers

3, 8, 13, ... 48 for 10 terms

This is an arithmetic sequence where a = 3, d = 5 and n = 10

Sum(10) = (10/2)(first + last)

= 5(3+48) = 255

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