Marlin was saving half-dollars. He started with 10 half-dollars in his container. He adds 2 half-dollars each day. How many half-dollars will he have on the 15th day? Choose the rule that matches this situation.

Is there options for the rules?

if he is adding 2half dollars every day and he started with 10, the equation will look like
y=2x+10
y being the total amount of half dollars that Marlin has after x amount of days.
In order to figure out how many half dollars he has after 15 days, you just have to plug in 15 to the x.
y=2(15)+10 which is 40