Exercise 18 Page 206

6 + n^2 + 1/2d We can see that the expression has three terms, 6, n^2 and 12d. Next, we will identify the coefficients and constants. A coefficient is a number that is multiplied by a variable or variables.Variables on their own, without a number next to them, actually have a coefficient of 1. A constant is a number with no variable factors. 6+n^2+1/2d ⇕ 6+ 1n^2+ 1/2d The expression has two coefficients, which are 1 and 12, and a constant, which is 6. Let's organize this information in a table.