Question

what is the sum of first seven multipels of 5

Answer 1

The Sum of the first 5 multiples of 7 is 105.

Answer 2

Answer:

140

Step-by-step explanation:

a= 5, d= 5, n= 7

$s7 = \frac{7}{2} \times (2 \times 5 + 6 \times 5)$

$= \frac{7}{2} \times (10 + 30) = \frac{7}{2} \times (40)$

$= 7 \times 20$

$= 140$

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