Explain why mathematics is not just a collection of formulas and theorems that people crammed into their head?

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!

Evaluate the expression for the given value of the variable 7a - 4a for a =8

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax