sama cara nya ya jawab

6x3 + 7x5 + 8x4 + 9x6 / 3+5+4+6
= 18+35+32+54 / 18
=139/18= 7,7

[tex]caranya \\ \frac{(6 \times 3) + (7 \times 5) + (8 \times 4) + (9 \times \: 6) }{3 + 5 + 4 + 6} \\ = \frac{139}{18} \\ = 7.7[/tex]