Let's calculate the areas of all three gardens
First garden
one garden that is 3 feet wide and 3 feet long
Area = length* width = 3 feet * 3 feet = 9 square feet
Second garden
3 feet wide and 6 feet long
Area = 3 feet * 6 feet = 18 square feet
Third garden
3 feet wide and 9 feet long
Area = 3 feet * 9 feet = 27 square feet
It means as we can see as the length increases by 2 times , the area also increases by 2 times every time.
1.50 + 0.50x < 25 ; x < 47 miles 3rd option in the choices.
I can eyeball points (1/2, 8), (1,4), (2,1), (3,1/4)
The pattern is each increment of 1/2 in x divides by two.

Any of the points give k=16

Check: x=1/2 4^(3/2)=2^2=8 good
x=1 4^(2-1)=4 good
x=2 4^(2-2)=1 good
x=3 4^(2-3)=1/4 good
Just use the coefficients for each variable and put it in a matrix. Is the second question set equal to something? Because then you would put it in place as the question mark. (Did the pic come through?)
So the 3x3 matrix is made up of the coefficients and then to augment the matrix, you add another column at the end with the solutions. Good luck!