Acar travels at a constant speed. what is the car's speed between checkpoints, expressed as a unit rate? use the information given in the picture.

The unit rate is 44 miles per hour.

Step-by-step explanation:

The difference between both the checkpoints is given by:

miles driven

Time taken to travel 88 miles = hours

As the car travels at a constant speed, so we get 88 miles driven in 2 hours.

Hence, per hour distance covered is = miles per hour.

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

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative