Maicol wants to plant coffee beans and plantains. Coffee beans yield 2,500 pounds per acre, the pound of coffee beans goes for $2.43. While plantains yields 1,200 plants per acre, a plantain tree can grow 100 pounds, and the pound goes for $1.99. He has a total of 50 acres to plant coffee beans and plantain trees. Maicol wants to use at least 15 acres for coffee beans and no more than 25, and a minimum of 20 acres for plantain. How many acres of coffee beans and plantain must be planted to maximize Maicol’s profit?

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

you would 18 *0.25 = 4.5

answer is 270 degrees: -

to convert radians to degrees you multiply by 180/π

9π/ 6 * 180 / π

=   9 * 180 / 6

= 9 * 30

=   270 degrees   answer