An inductor in an electric circuit is essentially a coil of wire in which the voltage is affected by a changing current. Bydefinition, the voltage caused by the changing current is given by VL=L(di/dt), where L is the inductance (in H). If VL=9.0−0.4t for a 3.0-H inductor, find the current in the circuit after 20 s if the initial current was zero.

After 20 s, the current is A.

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

to find the total number of combinations, multiply the quantity of each item by each other:

2 pairs of shoes x 3 pairs of shorts = 6 different combinations.

it is not that hard all u have to do is plot the graph

step-by-step explanation:

he has 140 chickens because he has 10 times more chickens than ducks and he has 14 ducks so 14*10=140