For each sequence, find the first 4 terms and the 10th term
1) 2n-1

1st term: 1, 2nd term: 3, 3rd term: 5, 4th term: 7 & 10th term: 19

Step-by-step explanation:

1st term: 2(1) - 1

              2 - 1 = 1

2nd term: 2(2) - 1

                4 - 1 = 3

3rd term: 2(3) - 1

               6 - 1 = 5

4th term: 2(4) - 1

               8 - 1 = 7

10th term: 2(10) -1

                20 - 1 = 19

a=24; b=12

step-by-step explanation:

a/b=2: 1

a=2b

36/(1+2)=12

b=12

a=24