Ch. 2 Review

Simplify

100

Simplify.  2x - 4x² + 8x

                                   

    

10x - 4x²

200

Simplify.  3x² - 5x + 7x - 9x²

-6x² + 2x

300

Simplify.  4(3p + 2) + 5(1 + p)

17p + 13

400

Simplify.     .25x - 3(.2x + .6)

-.35x - 1.8

500

Write the following as an algebraic expression and simplify if possible.  The sum of 3, 4 times a number, 8 and 2 times a number.

11 + 6x

Solve

100

8x + 4 - 4x = 3x

x = -4

200

4 + 8(x - 9) = 4

x = 9

300

.2(6m - 3) = .4(m - 2) + .2

m = 0

Percents

100

What is 25% of 80?

20

200

What is 47% of 139?

65.33

300

The Buckle has all sweatshirts on sale for 30% off.  If the original price of the sweatshirt you want is $62, what is the sale price?

$43.40

400

If you leave a 20% tip on a $42 bill.  How much $ would you leave in total?  (exactly)

$50.40

Formulas

100

Solve for r.  d = rt

r = d/t

200

Solve for h.  A = (1/2)bh

h = (2A)/b

300

Solve for d.  P = a + b + c + d

d = P - a - b - b

400

Solve for l.  S = 4lw + 2hw

l = (S - 2hw)/(4w)

Interval notation & Solve inequalities

100

Write the interval notation for x ≤ 2

(-∞, 2]

200

Write the interval notation for x > 18

(18, ∞)

300

Write interval notation for 3 ≤ x < 12

[3, 12)

400

Solve and write interval notation.  x ≥ -9 + 2x

(-∞, 9]