Two airplanes leave an airport at the same time, one going northwest (N35°W) at 401 mph and the other going east at 338 mph. How far apart are the planes after 4 hours to the nearest mile? 401.4 1604​

The manufacturer of a new product developed the following expression to predict the monthly profit, in thousands of dollars, from sales of the productwhen it is sold at a unit price of x dollars.-0.5x^2 + 22x - 224what is represented by the zero(s) of the expression? a. the profit when the unit price is equal to 0b. the unit price(s) when the profit is equal to 0c. the profit when the unit price is greatestd. the unit price(s) when profit is greatest

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)