Find the value of the expression:

p^2q^2+pq–q^3–p^3 for p=1 and q=−1

0

Step-by-step explanation:

(1)^2(-1)^2 +(1)(-1) -(-1)^3 -(1)^3

 = 1·1 -1 -(-1) -1

 = 1 - 1 + 1 - 1 = 0

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional