Final answer:
Marty's dog weighs 34.8 pounds, which is found by adding the weight of the cat (10.4 pounds) to the difference in weights (24.4 pounds).
Step-by-step explanation:
To find the weight of Marty's dog, we'll set up and solve a subtraction equation. Marty's cat weighs 10.4 pounds, which we are told is 24.4 pounds less than the weight of his dog. Let's denote the weight of the dog as D. The relationship between the weights of the dog and the cat can be written as:
D - 24.4 = 10.4
To solve for the weight of the dog, we add 24.4 to both sides of the equation which gives us:
D = 10.4 + 24.4
D = 34.8
Therefore, Marty's dog weighs 34.8 pounds.