Answer:

1.) disagree

2.) letter b costs more (not sure if I'm right)

Step-by-step explanation:

1.) (4x-7)(3x+7) using foil method, you will get 12x²+7x-49

while (4x+7)(3x-7) using the foil method, you will get 12x²-7x-49.

they are close but they are not the same, so disagree

2.) substitute the given value of x (which is 2) to the equations:

a.2(4x-7) pcs. at (2x+1) pesos each

2 [4(2)-7] pcs at 2(2)+1 pesos each

2 [8-7] pcs at 4+1 pesos each

2 [1] pcs at 5 pesos each

2 pcs at 5 pesos each

meaning 10 pesos ang nagastos niya kasi 2 ang binili niya

b. 3(4x-2) pcs. at (2x+1) pesos each

3 [4(2)-2] pcs at 2(2)+1 pesos each

3 [8-2] pcs at 4+1 pesos each

3 [6] pcs at 5 pesos each

18 pcs at 5 pesos each

meaning 90 pesos nagastos niya kasi 18 pcs binili niya

not sure if what i did was right