Traffic engineers studied the traffic patterns of two adjacent busy intersections at rush hour. At the first intersection, the average number of cars waiting to turn left was 17 with a standard deviation of 3 cars. At the second intersection, the average number of cars waiting to turn left was 25 cars with a standard deviation of 4 cars. (Assume the data collected at each intersection are independent).

the answer is here: : )

:

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

step-by-step explanation: the answer for wha if rt is 10 centimeters long, and wha is st? it’s 6