Algebra Demystified 2nd Ed

Chapter 7 linear equaTionS 207

3. V ;= πrh^ h

2

3

4. P = 2L + 2W; L


5. L = L 0 [1 + a(dt)]; a


6. S = C + RC; C


7. A = P + PRT; R


8. H

kAtt

L

 =  ()^12 − ; t 1

9. L = a + (n − 1)d; n


10. S rL a
    r

r

=  – 

– 

;

1

✔SOLUTIONS

1. Abhh

Abh

A bh

b

A

b

bh

A

b

h

=

=







=

=⋅

=

1

2

1

2

2

22

2

2

; 

2. Crr
   C r

C r

=

=

=

2

2

2

2

2

π

π

π

π

π

3. V rhh

r

V

r

rh

V

r

h

=

=⋅

=

π

ππ

π

π

2

22

2

2

3

33

3

3

;