Question

ДАЮ 200 балів!!!!!!!!!!!!❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️

Answer 1

1) m5-m4=d

18-14=4

d=4

m2= 2+4= 6

m3= 6+4= 10

m50= m1+49d= 2+49*4= 198

S50= (m1+m50)*50/2= 25(2+198)= 25*200=5000

2) a11=a1+10d

a15=a1+14d

a1+10d=18

a1+14d=8

10d-14d=18-8

-4d=10

d= -2,5

a1= 18+10*2,5= 18+25= 43