Help me! and how to get the answer!!

So me with this math problem. find the value of x the table shows the masses of 50 eggs. mass: 40-44 eggs: 6 mass: 45-49 eggs: x mass: 50-54 eggs: 12 mass: 55-59 eggs: 10 mass: 60-64 eggs: 7 mass: 65-69 eggs: 2 you!

Write two subtraction equations that are equivalent to 5 + 12 = 17.

What is the definition of exponential decay?