use gauss's approach to find the following sum
4+10+16+22++70
the sum of the sequence is

Each consecutive term in the sum is separated by a difference of 6, so the -th term is for . The last term is 70, so there are terms in the sum.

Now,

but also

Doubling the sum and grouping terms in the same position gives

answer: 1 and 3

step-by-step explanation:

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80