Bob nailed wooden board sections to a fence. he nailed 2/9 of a section in 1/10 of an hour. explain how to use the information to find two different unit rates

(I) The number of section nailed per hour is sections/hour.

(II) The number of hours spent to nail a section is hours/section.

Step-by-step explanation:

Bob nailed wooden board sections to a fence. He nailed 2/9 of a section in 1/10 of an hour.

From the above information, we can get two different unit rates and they are  

(I) The number of section nailed per hour and  

(II) The number of hours spent to nail a section.

Now, (I) the number of section nailed per hour is given by  

sections/hour.

Again, (II) the number of hours spent to nail a section will be given by  

hours/section. (Answer)

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