Homework Help: math

Posted by Annie on Tuesday, January 3, 2012 at 6:20pm.

Jamal got a job working on a assembly line in a toy factory, on the 20th day of work, he assembled 137 toys, he noticed that since he started , every day he assembed 3 more toys then the day before , how many toys did jamal assemble all together during his first 20 days

math - Reiny, Tuesday, January 3, 2012 at 7:11pm
easy ...

d = 3 and
term20 = 137
a+19d = 137
a + 57 = 137
a = 80

now take the sum of first 80 terms

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