Sec 1: Evaluating Expressions

Pre-Unit: Intro to Algebra II

Learning Target: I will evaluate algebraic expressions for a given value using the order of operations and technology.

Homework: pg 7 #1-10, 27, 37, 38, 41, 43 *Students are to show all work using the order of operations.

I saw it on Facebook – Really!

10 + 10 x 0 = ?

Like = 0 Share = 10

Comment = 20Write what you think it is in your notes.

If you want to change your answer do it now!

And the answer is…10Second Chance:

Like = 2Share = 288Comment = both

Write your answer in your notes.

Answer: 288

Evaluate the expression for x = 3.

A. 22B. -2C. 10D. -14

ACT Practice

P___________ E___________ M__________ D__________ A__________ S___________

Ex 1: Order of Operations

• Simplify (6-2)² - 4 + 9 ÷ 3 using the order of operations.

• Check yourself using your calculator.

• Did your answers match? If not, where did you go wrong?

A.

B.

C.

D.

Ex 2: Evaluate each expression using the order of operations and then check using your calculator.

•

Solution: 625

Solution: 2

Solution: -17

Solution: -28

Evaluate for w = 4, x = -3 and y = -5.

Try it again. Evaluate for h = 4, j = -1 and k = 2.

Ex 3: The Challenge!

The expression -0.3y + 61 models the percent of eligible voters who voted in presidential elections from 1960 to 2000. In the expression, y represents the number of years since 1960. Find the approximate percent of eligible voters who voted in 1988.

Suppose this expression holds true for future years. What percent of eligible voters will vote in the 2012 elections?

What would be some causes of the model not holding true for the future, including in the race between President Obama and Mitt Romney?

Ex 3: Election Time!

Solution: 52.6%

Solution: 45.4%

The volume, V, of the right circular cone with radius r and height h, shown below, can be found using the formula V = πr2h. A cone-shaped paper cup has a volume of 142 cubic centimeters and a height of 8.5 centimeters. What is the radius, to the nearest centimeter, of the paper cup?

A.  2 B.  4 C.  8 D.12 E.16

Ex 4: Extension

PG 7 # 1-10, 27, 37, 38, 41,43Show all work using the order of operations. You may use the calculator for only one operation at a time. Do NOT put the entire expression in the calculator.

Round to the 3rd decimal place when necessary.

HOMEWORK

1. 4.6 2. 323. 18.44. 2.65. 11.66. 4.167. 0.9698. 6.259. 0.610. A.31.4

% B. 48%

Solutions to Homework27. A. 584,336,233.6 miles B. 8761 hours C. Should be yes. See work.37. 70°F38. 95.0 (nearest tenth)41. 6.9