Question

I added attachment the two middle question...

Answer 1

Answer:

greatest value is 20

least value is 1

Step-by-step explanation:

for greatest value 3x should be maximum and 2x should be minimum possible value. put x=10 then, 3x will be 30. put y= 5 then 2y will be 10. so 3x - 2y = 30 - 10 = 20

for least value, 2y should be made as much higher than 3x as possible. put x = 5 and y = 10 then 3x - 2y = 3 x 5 - 2 x 10 = 15 - 20 = -5