Question

1. What are the first four terms of an arithmetic sequence of the common difference is 1.5 and the first term is 15?
a. 15, 30, 45, 60
b. 15, 16.5, 18, 19.5
c. 15, 22.5, 33.75, 50.625
d. none of the above

2. What are the first four terms of a geometric sequence of the common ratio is 10 and the first term is 4.5?
a. 4.5, .45, .045, .0045
b. 4.5, 9.0, 13.5, 18.0
c. 4.5, 14.5, 24.5, 34.5
d. none of the above

Answer 1

b for the first one, just add 1.5 to 15 and then continue that on to the sums.
for B it'd be 4.5, 14.5 so I believe it's be c in the next