What is the common difference of an arithmetic sequence defined by the general formula: an=4n+5

answer: what are the following choices

d. all of the above

step-by-step explanation:

the correct answer is c

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x