A3 Section 1.3Models and Applications

Homework: p. 132-133 1-41 odd

Word Problems!! Wahoo!!Strategies…Don’t Panic!!

1) Read problem carefully. I usually underline what the important information is.

2) Define the variable (s).3) Write expressions in terms of the variable.4) Solve the equation5) Check to make sure it makes sense…Example 1 p. 123 “Starting Salaries for College Graduates with Undergraduate Degrees”

Example 3 p. 126 “Selecting a Monthly Text Message Plan”

Example 5 p. 128 “Solving a Dual Investment Problem”

Geometry formulas that you are responsible to know:

2Square: Area:

Perimeter: 4

A s

P s

Rectangle: Area:

Perimeter: 2 2

A lw

P l w

Still more geometry formulas…

2Circle: Area:

Circumference: C=2 r

A r

1Triangle: Area:

2Perimeter: P=

A bh

sides

1 2

1Trapezoid: Area: ( )

2Perimeter: P=

A h b b

sides

3Cube: V sRectangular Prism: V lwh

2Circular Solid: V r h

34Sphere: V

3r

21Cone: V

3r h

1Pyramid: V (area of base)

3h

Guided Practice:The length of an American football field is 200 feet more than the width. If the perimeter of the field is 1040 feet, what are its dimensions?

Whiteboard Problem:The length of a rectangular pool is 6 meters less than twice the width. If the pool’s perimeter is 126 meters, what are its dimensions?