Question

(ii) Find the sum of 5+8+11+....to 10 terms using the formula.​

Answer 1

Answer:

your answer is in attachment above

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Answer 2

Answer:

a=5

d=8-5=3

n=10

sn=?

using formula

sn=n/2{2a+(n-1)d}

=10/2{2(5)+(20-1)3}

=5{10+(9)3}

=5(10+27)

=5(37)

sn= 185.