Answer:
i don't know
Step-by-step explanation:
so i have 20 the answer i thin
Sn = n/2 ( a1+an)
= 6/2 (10+85)
= 3 (95)
= 285
Answer:
-3
Step-by-step explanation:
f(x)=x²-8x-12
f(-1)=(-1)²-8(-1)-12
=1+8-12
=-3
Multiply 10 x 20 and change the sign
-200