Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 s?

Step-by-step explanation:

Alright, lets gets started.

We have given the distance as 100 meters.

The time for completing this distance is 20 seconds.

The formula for calculating speed is :

Hence plugging the values of distance and time in formula,

meters per second

We could further simplify this speed to 5 meters per second, but as the expression is asked in question, we will given answer meters per second.  

Hope it will help :)

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

what do u need to know

step-by-step explanation: