Math 101 Intermediate Algebra    Word Problems
Chapter 2, Sections 3 and 4

Solving Word Problems

2. Draw a picture (if you can) illustrating the problem.

3. Identify unknown quantities you're being asked to find.

4. Choose a variable to represent one quantity.

5. Write down, in words, what the variable (you chose in 4) represents.

6. Represent other quantities to be found in terms of the variable (you chose in 4).

7. Write the word problem as an equation (hard step--takes practice).

8. Solve the equation for the unknown quantity.

10. Check your solution in the original word problem.

Some Common Formulas

Formula Use
A = r2 Area of a circle.
C = 2 r Circumference of a circle.
A = LW Area of a rectangle.
L is length, W is width
P = 2L + 2W Perimeter of a rectangle.
L is length, W is width
 A = 12 BH
Area of a triangle.
B is base length, H is height
a2 + b2 = c2 Pythagoean theorem for a right triangle.
a, b lengths of legs
c length of hypotenuse
A = Prt Simple interest.
A is interest earned,
P is the principal,
r is the interest rate (decimal),
t is time
 A = P(1 + rn ) 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 years
A = Rt Rates.
A is amount, R is rate, t is time
d = vt Distance and speed.
d is distance, v is speed, t is time
 C = 59 (F - 32)
Temperature conversion.
F is degrees Fahrenheit

Examples we might do in class

2.3.6
2.3.18
2.3.24
2.3.30
2.3.40
2.4.6
2.4.12
2.4.18
2.4.28
2.4.36
2.4.50
2.4.54