5 Σ (10)^k-1 K=1 I recently had to do this problem. Pain in the a** if you ask me but I solved it for you, so it's okay :D
Using a pen or a keyboard
1000+40=1040 1040+1000=2040 2040+30=2070 2070+1000=3070 3070+20=3090 3090+1000=4000 4000+10=4100
10001
111111111111111111121111
Oh, dude, 500 plus 500 is like, totally 1000. It's like, basic math, you know? So, if you were wondering if you could afford that new gaming console with your birthday money, I got you covered. It's a grand total of 1000 bucks.
1000 plus 10000 equals 11000
5000 + 8250 + 100 + 1000 + 6500 + 1000 + 6500 + 1500 + 1500 + 10000 + 1000 + 10000 + 100 + 8250 + 5000 + 5000 + 8250 = 78,950
4Σ (12 - 4i)i=0
Using a pen or a keyboard
It is not clear whether the question is 3a + 4a + 5a + 6a^3 which would be 12a + 6a^3 or 3a + 4a + 5a + (6a)^3 = 12a + 216a^3 or (3a + 4a + 5a + 6a)^3 = 5832*a^3 But none of these really require summation notation!
15729=10000+5000+700+20+9 or the highest digit plus next highest plus nexthighest and so on
Hit the Math button (Right under ALPHA) and it should already be on the MATH tab. go down to summation ∑( and you're set!
42003 + 10000 = 52003
40000 + 10000 = 50000
25 + 10000 = 10025.
6000.......it's actually 5,100
Yes of course. Order does not affect summation's result.