Question

answer the question ​

Answer 1

Answer:

6. a) -320

7. c) 38

8. a) 45

Answer 2

Answer:

6.option (a)-320

7.option (c)38

8.option(a)45

Step-by-step explanation:

6. Given a=10

common difference =-4

no.of terms=16

S16=?

Sn=n/2{2*10+(16-1)-4}

s16=16/2{2*10+(16-1)-4}

s16=8{20+(-60)}

s16=8{-40}

s16=-320