Chapter 3

Question 1

An Equation is?

Answer 1

A mathematical sentence stating that 2 expressions are equal.

Question 2

A solution to

Answer 2

An equation has a replacement value for the variable that makes the sentence true.

Question 3

Percent formula:

Answer 3

P=B•A
Percent • Base= Amount
30%•$15.00=$4.50
Or
.30•15.00=4.5

Question 4

Simple Interest:

Answer 4

I=prt
Interest= principal•rate•time: R(T) has to be comparable.
Only calculate once.
Ex. 1 mo=1/12 year 8 mo=8/12 year, 12 mo=1 year,
And
18 mo=18/12=1.5 years, 24 mo= 2 years.

Question 5

Mixture Formula:

Answer 5

Q=AR
Quantity=Amount•Percent
Q= quantity of solution in substance.
A= amount of the solution.
R= percent concentration of substance

Question 6

Distance Formula:

Answer 6

D=RT
Distance=Rate•Time
Remember turn mins in to factions.
Ex. 15 mins=1/4, 30 mins=1/2, 45 mins=3/4, 1 hour= 1 or 1.0

Question 7

An easy way to turn % into a decimal?

Answer 7

Move the decimal 2 # places to the left
Ex. 100%=1.00=1,
12.5%=.125, 
240%=2.40=2.4
5%=0.05=.05

Question 8

An easy way to turn decimal into a %?

Answer 8

Move the decimal 2 places to the right.
Ex. 1.00or 1=100%
.125=12.5%
0.05=5%
2.40or 2.4=200%

Question 9

How do be successful at word problems?

Answer 9

1. Read the whole problem carefully
2. Understand the key words
3. Write formula out
4. Follow order of operations
5. Check answer