Question

t4=-15andt9=-30 find sum of first 10 numbers​

Answer 1

Answer:

a + 3d = -15

a + 8d= -30

Step-by-step explanation:

-5d=15

d = -3

a -9= 15 a= -6

by putting formula

S= n/2 2a + (n-1)*d

u can easily get ur answer

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