Answer:
C
Step-by-step explanation:
I really don’t think it’s correct but I got x=4, hope this can help you
8*2=16
8*8=64
d+d+d=3d
16+64=80d3rd
27 are oatmeal raisins, because of 45=5*9 then 3*9=27. You could also do this by doing a chart where I put 5 circles on the side and 9 circles on the top and made a total of 45 circles. Then I colored 3 out of 5 and got 27 colored, or you can just do the multiplication way.
Answer:
3156
Step-by-step explanation:
- <em>Used formula:</em>
- <em>(1² + 2² + 3² + ... + n²) =1/6*n(n + 1)(2n + 1)</em>
--------
- 10²+12²+14²+......+26² =
- (2*5)²+(2*6)² + (2*7)² + ... + (2*13)² =
- 4*(5²+6²+7²+...+13²) =
- 4*(1²+2²+...+13² - (1²+2²+3²+4²)) =
- 4*(1/6*13(13+1)(2*13+1) - (1+4+9+16)) =
- 4*(1/6*13*14*27- 30) =
- 4*(819 - 30) =
- 4*789 =
- 3156
