Question

Which of the following is the algebraic expression that best describes the sequence 4, 8, 12, 16, …?

Answer 1

4,8,12,16

this is an arithmetic sequence with a common difference of 4. This means u have to add 4 to each term to find the next number

an = a1 + (n - 1) * d
a1 = first term = 4
d = common difference = 4

so ur formula is : an = 4 + (n - 1) * 4 <==