__Word Problems__Chapter 2,

**Solving Word Problems**- Read the problem carefully.
- Draw a picture (if you can) illustrating the problem.
- Identify unknown quantities you're being asked to find.
- Choose a variable to represent one quantity.
- Write down, in words, what the variable (you chose in 4) represents.
- Represent other quantities to be found in terms of the variable (you chose in 4).
- Write the word problem as an equation (hard step--takes practice).
- Solve the equation for the unknown quantity.
- Answer the question asked in the word problem.
- Check your solution in the original word problem.

**Some Common Formulas**Formula Use A = r ^{2}Area of a circle.

r is the radiusC = 2r Circumference of a circle.

r is the radiusA = LW Area of a rectangle.

L is length, W is widthP = 2L + 2W Perimeter of a rectangle.

L is length, W is widthA = __1__

2BH Area of a triangle.

B is base length, H is heighta ^{2}+ b^{2}= c^{2}Pythagoean theorem for a right triangle.

a, b lengths of legs

c length of hypotenuseA = Prt Simple interest.

A is interest earned,

P is the principal,

r is the interest rate (decimal),

t is timeA = P(1 + __r__

n) ^{nt}Compound interest.

A is interest earned,

P is principal,

r is interest rate (decimal),

n is number of times interest is paid per year,

t is time in yearsA = Rt Rates.

A is amount, R is rate, t is timed = vt Distance and speed.

d is distance, v is speed, t is timeC = __5__

9(F - 32) Temperature conversion.

F is degrees Fahrenheit

C is degrees Centigrade