janet can make 4/5 of a necklace in 20 minutes. at this rate, how many necklaces, to the nearest tenth of a necklace, Can Janet make in 1 hour ?

Step-by-step explanation:

Janet can make:

4/5 of a necklace in      20min

2(4/5)=8/5 in       40 min

3(4/5)=12/5 in    60 min( one hour)

12/5=2 2/5 necklaces in one hour

or 2.4n in one hour

a; x = 0.5

step-by-step explanation:

-10x = -5

x = 0.5

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