1. Bill decided to buy six books on history instead of four books on politics. It follows, then, that
the opportunity cost of each history book was
books on politics.

In a certain pentagon, the interior angles are a,b,c,d,e where a,b,c,d,e are integers strictly less than 180. ("strictly less than 180" means they are "less than and not equal to" 180.) if the median of the interior angles is 61 and there is only one mode, then what are the degree measures of all five angles?

Solve the system of equations y= 3/2 - 1, -x+ y =-3

How many grams the dog will eat in 3 days?