Nodin is earning money for a longboard by selling lemonade at the soccer fields. Being a precocious and poorly-supervised 12 year old, Nodin has no transportation and decides to use water from a nearby river.
Business is booming! He sells 32 lemonades on the first day, and 6 additional lemonades each day as the summer heats up. How many TOTAL cups of giardia-laced lemonade will Nodin have sold by the time his parents get a call from county health officials on day 10?
Hint: Use an = a1 + (n-1) d and Sn = n/2 (a1+an)