First term: 8
Last term: 40.5
Growth factor or constant multiplier = 1.5
To solve this problem, we need to find out the factor that each number grows by. Since this is a geometric sequence, we know that multiplication is involved to get from term to term. To find the factor, we can divide any term by the term before it. Doing this, we get:
18/12 = 1.5
To find the first term, we divide 12 by the factor as follows:
12 / 1.5 = 8
To find the last term, we multiply 27 by the factor as follows:
27 * 1.5 = 40.5