Huether's Pre-Algebra Ch. 2 Review

Expressions

100

x - (y + 7) when x = 9 and y = 3

1

200

2ab - 3b when a = -2 and b = -3

21

300

Consider the expression 6x² - 5y -z + 8

a. How many terms?

b. What are the coefficients?

c. What is the constant term?

a. 4

b. 6, -5, -1

c. 8

400

What is the absolute value of 4x²y when x = 3 and y = -5

180

500

3a²/(c+1) when a = 8 and c = 5

32

Distributive Property

100

6(3 + 9) = 6(3) + 6(?)

9

200

-5(2-7)

25

300

(r + 2)13

13r + 26

400

(x² - 3y + 5)y 

x²y - 3y² + 5y

500

32x - 16 = 16(?)

2x - 1

Word Phrases

100

The product of a number and 14

14n

200

6 increased by twice a number

6 + 2n

300

9 more than the product of 5 and x

5x + 9

400

The square of the sum of a and b

(a + b)²

500

The sum of 27 and twice the opposite of y.

27 + 2(-y) or 27 + -2y

Scientific Notation

100

If my beginning number in standard form is between 0 and 1, will my exponent be positive or negative?

negative

200

How many significant digits does 10.02 have?

4

300

Write 12.67 x 10² in scientific notation

1.267 x 10³

400

Write 4.26 x 10^-5 in standard form.

0.0000426

500

State the missing exponent

0.00000000089 = 8.9 x 10^?

-10

Estimating

100

Estimate the total by rounding each cost to the nearest dollar: soap $5.49, shampoo $12.98, conditioner $9.84, and hair dryer $34.94.

$63

200

Estimate by rounding each term to the hundreds place:

9146 + 2362 - 875

10,600

300

If cement costs $67 a cubic yard, and the driveway requires approximately 12 cubic yards, estimate the cost for the cement needed to make the driveway. 

70 x 10 = $700

400

Estimate the product

895 x 216

180,000

500

Estimate by rounding each term to its highest place value.

8273 + 3901 + 1776 - 3880 

10,000