1. Standardized Test Practice EXAMPLE 1

2. SOLUTION Standardized Test Practice Write and solve a two-step equation to find the number of flamingos. Write a verbal model. Let n be the number of additional flamingos.

3. EXAMPLE 1 Standardized Test Practice 2370 = 395n + 1580 Write an algebraic model. 2370 – 1580 = 395n + 1580 – 1580 Subtract 1580 from each side. 790 = 395n Simplify. 790 395 395n 395 = Divide each side by 395. 2 = n Simplify.

4. EXAMPLE 1 ANSWER The zoo can buy 2 new flamingos next year. An equation for finding the number of flamingos is 2370 = 395n + 1580. The correct answer is B. Standardized Test Practice

5. GUIDED PRACTICE for Example 1 Feeding Costs 1. It costs a zoo $1150 this year to feed tortoises. Each new tortoise costs $575 to feed. A zoo’s budget for tortoise food next year is $2875. How many new tortoises can the zoo buy next year? ANSWERThe Zoo can buy 3 new tortoises next year