Write an algebraic expression to represent each situation.

1. There are three different ways in which a basketball player can score points during a game. There are 1-point free throws, 2-point field goals, and 3-point field goals. An algebraic expression can represent the total points scored during a game. Ex 1: Write an algebraic expression to represent each situation. • A. the number of apples in a basket of 12 after n more are added • B. the number of days it will take to walk 100 miles if you walk M miles per day 12 + n

2. Ex 2: Evaluate the expression for the given values of the variables. • 2x – xy + 4y • for x = 5 and y = 2 • q2 + 4qr – r2 • for r = 3 and q = 7 2(5) – (5)(2) + 4(2) (7)2 + 4(7)(3) – (3)2 10 – 10 + 8 49 + 4(7)(3) – 9 0 + 8 49 + 84 – 9 8 124

3. Remember! Terms that are written without a coefficient have an understood coefficient of 1. x2 = 1x2 Recall that the terms of an algebraic expression are separated by addition or subtraction symbols. Like terms have the same variables raised to the same exponents. Constant terms are like terms that always have the same value. To simplify an algebraic expression, combine like terms by adding or subtracting their coefficients. Algebraic expressions are equivalent if they contain exactly the same terms when simplified.

4. Simplify the expression. Ex 3: A. 3x2 + 2x – 3y + 4x2 3x2 + 2x – 3y + 4x2 7x2 + 2x – 3y B. j(6k2 + 7k) + 9jk2 – 7jk 6jk2 + 7jk + 9jk2– 7jk 15jk2

5. Ex 4: A. Apples cost $2 per pound, and grapes cost $3 per pound. Write and simplify an expression for the total cost if you buy 10 lb of apples and grapes combined. Let A be the number of pounds of apples. Then 10 – A is the number of pounds of grapes. 2A + 3(10 – A) = 2A + 30 – 3A = 30 – A B. Apples cost $2 per pound, and grapes cost $3 per pound. What is the total cost if 2 lb of the 10 lb are apples? Evaluate 30 – A for A = 2. 30 – (2) = 28 The total cost is $28 if 2 lb are apples.