To find the final cost of the pants with the discount, coupon, and rebate, we need to apply each one in turn.
First, let's calculate the discount:
Discount = 40 * 30% = 40 * 0.3 = 12
So, the discount is $12.
Next, let's subtract the coupon amount:
Cost after coupon = 40 - 12 - 5 = 23
Finally, let's subtract the rebate amount:
Final cost = 23 - 4 = 19
So, the final cost of the pants with the discount, coupon, and rebate is $19.