jack wants to buy an electric guitar. he began the the year with some money saved to buy the guitar, and each week he adds a fixed amount to his savings. if y represents the total amount jack has saved after x weeks, which of the following situations is represented by the table below?

a.

jack initially had $45 saved, and the amount is increasing at a rate of $15 per week.

b.

jack initially had $45 saved, and the amount is increasing at a rate of $30 per week.

c.

jack initially had $75 saved, and the amount is increasing at a rate of $15 per week.

d.

jack initially had $75 saved, and the amount is increasing at a rate of $30 per week.