Identify variables, constants, and coefficients in algebraic expressions and word problems. Fill in a table for expressions.

Here are the answers to the exercise: 1. Are the following examples of variables or constants? a) The number of hours in a day: Constant* b) The number of hours of daylight in a day: Variable* c) The number of sides in a pentagon: Constant* d) The perimeter of pentagons: Variable* 2. What information do you need to answer the following questions? a) How much does it cost to make a telephone call? You need the cost per minute/call and the duration of the call*. b) What is the area of a rectangle? You need the length and width* of the rectangle. c) How tall is a tree? You need the height measurement* of the tree. d) How much would you pay to make 5 phone calls? You need the cost per phone call*. 3. Copy the following table into your answer book and fill in the variable(s), constant(s) and the coefficient(s) of each algebraic expression: a) Expression: 3 Variable(s): None Constant(s): 3 Coefficient(s): None b) Expression: 5x Variable(s): x Constant(s): None Coefficient(s): 5 (for x) c) Expression: x-1 Variable(s): x Constant(s): -1 Coefficient(s): 1 (for x) d) Expression: (x)/(2) - 3 × n + 7 ÷ y - 4 Variable(s): x, n, y Constant(s): -4 Coefficient(s): (1)/(2) (for x), -3 (for n), 7 (for y^-1 in (7)/(y)) 3 done, 2 left today. You're making progress.