Warm-up

1
Warm-up

• 1. Name all the members of the real number
  system.
• 2. Name 3 different words that have the same
  meaning as the four operations of math.

• Answers
• Counting or natural numbers, whole numbers,
  integers, rational and irrational make up the
  real number system.
• Add more than, increased by, sum, total
• Subtract minus, less than, decreased by,
  difference
• Multiply product of, times, multiplied by
• Division divide, quotient, into

2
Evaluate each algebraicexpression.
Ex. 1 17-3x, for x -12
Answer 53
YOU TRY
3x-6(4 - y), for x -6 and y 10
Answer 18
3
Write each phrase as an algebraic expression.

• Ex 2 Three less than four times a number

Answer 4x - 3
YOU TRY
The difference between the product of negative
two and a number and negative three times the
number
Answer x
4
Mathematical Modeling
Use this formula to answer Ex 3. P 0.72x2
9.4x 783
5
Ex 3 P 0.72x2 9.4x 783
The formula models the gray wolf population, P,
in the U.S., x years after 1960. Use the formula
to find the population in 1990.
P 0.72(30)2 9.4(30) 783
Where did we get (30)?
P 0.72(900) 9.4(30) 783
P 648 282 783
P 1713
6
Ex 3 How well does the formula model the
actual data shown in the bar graph?

• Graph shows 1700
• Formula shows 1713

Answer Quite well
7
You try The formula models the gray wolf
population, P, in the U.S., x years after 1960.
Use the formula to find the population in 2003.

• How well does the graph predict the population
  in 2003?

Answer Formula is 2518 Graph is 2500 Fits
pretty well
Summary/Reflection On the rubric scale from 1 to
4, 4 meaning you understand and could teach this,
how well did you remember the concepts of
todays lesson? Explain your choice.