Chapter 6/7 Closure

Probability

300

124a

If there are 27,000 undergraduates at the school, what is the probability of being a senior in the performing arts?

(0.18)(5724)/27,000=1030/27000=3.8%

400

124b

Independent.

The probability of being in performing arts is always 18%

500

124c

Since independent

P(senior given performing arts)=P(senior)

5724/27000=21.2%

Simplifying

100

111a

2

200

111b

4

300

111c

625

400

113a

10+2i

500

113b

-16+30i

Factoring

100

107a.

(x+6)(x-5)

200

107b

x(-3x+2)(x-7)

300

107c

not factorable

400

107d

2x(x+3)(3x-4)

Triangles

100

109a

2 cm

2sqrt2

200

109b

60 degrees

4sqrt3

300

109c

30 degrees

3

3sqrt3

400

110a

x=9

500

110b

x=26

Quadratics

100

112a

x=1 

x=-7/3

200

112b

x=6

x=-3

300

112c

x=-2+-sqrt3

400

112d

x=-4

x=1.5