Let cost of blouse: x
cost of pair of pants: x + 600
Minimum total amount: 1,200 pesos
x + x+600 ≥ 1,200 ⇒ Mathematical sentence
2x ≥ 1,200 ⇒ Mathematical sentence simplified
a) No, it's not a quadratic equation. The equation is not a second-degree polynomial.
b) It is a linear inequality equation. The equation is in first degree, meaning the leading term 2x is raised to 1 (exponent/power is 1 only)
c) Mathematical sentence: (x) (x+600) ≥ 1,200
2x + 600 ≥ 1,200
CLUE: The word at least means "minimum". If Edna paid a minimum amount of 1,200 pesos, the total cost of pants and blouse is 1,200 pesos or above 1,200 pesos.