The arithmetic sequence a; is defined by the formula: Q1 =-3
Q; = 0;-1 – 5
Find the sum of the first 490 terms in the sequence.

38 was the other number of your question.

measurement of the swimming pool is given as = 7 yards 4.79 feet

first we will convert this to yards only.

1 foot = 0.33 yards

so, 4.79 feet = yards

so total yards are = yards

now we will convert this in meters.

1 yard = 0.914 meters

8.580 yards = meters

0.842 m = 0.842*100 = 84.2 cm

this becomes 7 meters and 84.2 cm

hence, the pool is 7 meters and 84.2 cm wide.

the circumference is c≈245.04

15 / 2 = 7.5

100 / 7.5 = 13.