The sum of arithmetic series is given by:
Sn=n/2(a1+an)
where:
n=number of terms
a1=first term
an=nth term
but
n=18, an=275, Sn=4185
plugging the values in the formula we get:
4185=18/2(a1+275)
simplifying this we get:
4185=9(a1+275)
dividing through by 9 we get:
465=a1+275
thus
a1=465-275
a1=190
Answer: first number is 190
The lenth at the deep end is 12 ft becuase u divide 210 and 12 and if it goes into it evenly u got ur answer
3000000...........
10^6 =1000000 (3) = 3000000
35 squared + 35 squared
rad 2450
35 rad 2
