Mathematics Homework Help

Mathematics Homework Help. How can I read this summation?

If you have all the data, what do you do? Sum up all the z,P,Pvg values at once? Or do you do run three separate calculations? How does one interpret this summation?

Mathematics Homework Help

 
"Our Prices Start at $11.99. As Our First Client, Use Coupon Code GET15 to claim 15% Discount This Month!!"