yg tau caranya mohon dijawab yaa ..mkasiiiii

14).10+6+15+24=16+15=31+24=55 maaf klo salah
15).6+1/3= 6×3+1=19
maaf klo salah
semoga membantu

14. Sn = n(2a + (n - 1)b/2
S10 = 10(2(6) + (10 - 1)9/2
= 10(12 + (9)9)/2
= 10(12 + 81)/2
= 10(93)/2
= 930/2
= 465