Algebra Demystified 2nd Ed

Chapter 8 linear appliCaTionS 239

3. The salary is $410, so S = 200 + 0.10s becomes 410 = 200 + 0.10s.

410 200 010

200 200

210 010

210

010

2100

=+

−−

=

=

=

.

.

.

s

s

s

s

The week’s sales level was $2100.

4. The volume is 1140 cubic inches, so V = 120h becomes 1140 = 120h.

1140 120

1140

120

95

=

=

=

h

h

. h

The box needs to be 9.5 inches tall.

5. The volume is 25.088o cm^3 , so V = 7.84oh becomes 25.088o = 7.84oh.

25 088 784

25 088

784

32

..

.

.

.

oo

o

o

=

=

=

h

h

h

The height of the cylinder needs to be 3.2 cm.

6.^59 ()F –  32 represents degrees Celsius, and 2F represents twice degrees

Fahrenheit. We want these two quantities to be equal.

95 (F−=^32 )^2 F