wave frequency is measured in units called hertz
(hz). one hertz is defined as one wave per second.
suppose a person counted 10 waves passing by over
a time period of 1 second. what is the wave
frequency?

what is all that apply?

hiking down a winding trail.

step-by-step explanation:

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

a)(x-2)^2+(y-1)^2=9

step-by-step explanation:

(picture explains)