 1. Write the reciprocal rate of 40  2. A small plane can travel at a rate of 380 miles per hour. How many miles is a flight that lasts 2.5 hours? 380.

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Presentation transcript:

 1. Write the reciprocal rate of 40  2. A small plane can travel at a rate of 380 miles per hour. How many miles is a flight that lasts 2.5 hours? 380 * 2.5 = 950 miles  3. The speed of the fast-train in France (TGV) is 300 km/hour. What is the speed in km/second?

Lesson 2.5

 Multiplication Property of -1 For any real number a, a -1 = -1 a = -a  Rules for Multiplying + / - numbers 1. The product of an odd number of negative numbers is negative. 2. The product of an even number of negative numbers is positive.

 -4x -3y =  -4x + -3y =  12xy -4x + -3y -30 1

 Evaluate y = ax 2 + bx + c,when a = -2, b = 3, c = 4, and x = -5 y = -2(-5 2 ) + 3(-5) + 4 y = (-5) + 4 y = y = -61

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