1)a1=6,a13=42, a13=a1+12d,42=6+12d, 12d=36,d=3
a10=a1+9d=6+9.3=33
s10=10/2(a1+a10),s10=5.(6+33)=5.39=196
s10=196
2)a6=45,a14=-43,a14=a6+8d, 8d=a14-a6
8d=-43-45=-88, d=-88/8=-11,d=-11
a6=a1+5d, a1=a6-5d,a1=45-5.(-11)=45+55=100,a1=100
a10=a1+9d=100+9.(-11)=100-99=1,a10=1
s10=10/2(100+1)=5.101=505
s10=505
4c^2-8c-(c^2-8c+16)=
4c^2-8c-c^2+8c-16=
3c^2-16
проходит через точку А (4;3)