Answer:
36 hamburgers.
Step-by-step explanation:
He sold 81 hot-dogs, that's 9 unit.
9 units → 81
1 units → (81/9)
1 units → 9
4 units → 36
Therefore vendor sold 36 hamburgers.
x +y 600
no
Given
1 + 4(3x - 10) - 12x ← distribute the parenthesis
= 1 + 12x - 40 - 12x ← collect like terms
= 1 - 40
= - 39 ≠ - 9