Math Homework Help! 2 Problems! 10 points to whoeva can solve and explain it!?

LoverV · #1 (**permalink**) 04-07-2008, 10:33 PM

Break the problem into smaller, simpler problems. Them solve.

1. Find the sum.
13 + 23 + 33 + 43 + ... + 153

2. Find The sum.
20 + 40 + 60 + 80 + ... + 300

Lyly V · #2 (**permalink**) 04-07-2008, 10:33 PM

Okay, I got it. #1. 415 * 3 = 1245. #2. 1170 * 2 = 2340

Cheese Grater · #3 (**permalink**) 04-07-2008, 10:34 PM

I'll give you an example.

The sum from 1-100 consecutively.

Keep in mind that 1+100=101 and 2+99=101, etc. That pattern goes on to 50+51. Therefore the answer is 101 times 50 = 5050. You multiply by 50 because you're adding 2 of the terms at a time for a total of 101 terms.

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