Find the minimum value of c = 4x + 3y Subject the the following constraints:
(x ≥ 0 , y ≥ 0)
2x + 3y ≥ 6
3x - 2y ≤ 9
x + 5y ≤ 20

Linear programming - Linear systems !

Which statement describes surface features called maria on the moon

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.