Final answer:
In the expression, 42b, b represents the number of baskets being bought, and 42 represents the price of each basket.
Step-by-step explanation:
A mathematical expression is a combination of numbers, variables, operators, and symbols arranged in a meaningful way. It represents a mathematical statement and can be evaluated to produce a numerical result. Expressions can involve arithmetic, algebraic, or other mathematical operations. In the expression, 42b, b represents the number of baskets being bought.
It is a variable that can take on different values depending on the situation. For example, if you want to buy 5 baskets, then b would be equal to 5. The number 42 represents the price of each basket. It is a constant value that does not change. So, in the expression 42b, it means that we are multiplying the price $42 by the number of baskets b to find the total price.