What is the mathematical expression for the product of 9 and a number

What are “like terms”? why can we only add like terms?

If benito is selecting samples of five values from the table, which row will result in the greatest mean? population data row 1 4 2 2 3 3 row 2 3 3 4 3 2 row 3 2 4 3 4 3 row 4 3 4 4 7 3 row 1 row 2 r

6cm10 cma conical paper cup has dimensions as shown in the diagram. how much water can the cup hold when full?