Question

Answer it asap


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Answer 1

a10= 39

a+9d =39 -1

a17= 67

a+16d = 67 -2.

subtracting eq 1 and 2

a+9d=39

a+16d=67

we get -7d = -28

d= 4

put in eq1

a+9d=39

a+ 36= 39

a= 3

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

S = 26/2+(2×3+(26-1)4.

S= 13 + ( 6+(25)4

S= 13+(6+100)

S= 13+106

S= 119

Answer 2

So your final answer is 1378.

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