If you can answer question 3 I’ll give you brainliest and 50 if you can explain this question to me but I’ll give you 50 on another question that I’ll put

Which one is true about the hexagons ?

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

Use sigma notation to represent the following series for 9 terms.