A dietician has two foods with which to prepare a diet containing at least 400 units of calcium, 175 units of iron, and 280 units of vitamin A. The table below gives the units of calcium, iron,
and vitamin A per ounce for the two foods.
FOOD I FOOD II
CALCIUM1220
IRON1412
VITAMIN A1025
Food I costs 35 cents an ounce and Food II costs 42 cents an ounce. What combination of the
two foods gives the diet, meeting the above requirements, of minimum costs?

"curse these trig-loving pirates! " devora mutters as she looks at the map. then, after thinking for a moment, she walks back to the entrance of the secret cave, measuring 48 meters along the way. after performing a calculation, devora walks back to the empty treasure, faces the entrance, and turns a certain number of degrees to her left before walking 89 meters to the treasure. supposing that the angle at the cave entrance is acute and that devora's calculations were correct, how many degrees did she turn?