PreCalcPlease check
posted by Bethany .
Please check:
1.Write in expanded form: this is a sigma notation
4 on top
signma in middle
k=1 on bottom
to right of sigma is (k1)(k2)
I solved:
k=1 (11)(12)=0(1)=0
K=2 (21)(22) = 1(0)=0
k=3(31)(32)=2(1)=2
k=4 (41)(4)=3(2)=6
answer: 0+0+2+6
2. Write 4+9+16+25+36+49+64 in sigma notation
answer: 8 on top
sigma in middle
i=2 on bottom
x^2 to right of sigma
3. Write 88+79+70+61+...+83 in sigma notation
my work:there is (9) common difference
979(1)=88
979(2)=79
979(3)=70
979(4)=61
979(20)= 83
20 on top
sigma in middle
answer:i=1 on bottom to right of sigma is 979n
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