Final answer:
The minimum number of toys, (n), that Natalie should sell in order to earn at least $70 per day is given by the inequality 43 + 3n ≥ 70.
Step-by-step explanation:
To find the minimum number of toys, (n), that Natalie should sell in order to earn at least $70 per day, we can set up an inequality. Let's represent the number of toys sold by n. We know that $70 is the minimum amount Natalie wants to earn, so we can write the inequality as:
43 + 3n ≥ 70
This inequality states that the sum of $43 and 3 times the number of toys sold, n, must be greater than or equal to $70. By solving this inequality, Natalie can determine the minimum number of toys she needs to sell to reach her goal.