7 calculators cost $140.00

write this in rate(ratio) and the unit rate
me : )

  ratio: $140/(7 calculators)

  unit rate: $20/calculator

Step-by-step explanation:

For rates involving prices, we're usually interested in the price per item, so we divide the cost by the number of items to form the appropriate rate. Simplified, it is the unit rate.

  ratio = $140/(7 calculators) = $20/calculator = unit rate

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A "unit rate" is a rate with 1 (unit) in the denominator.

"per" can usually be considered to mean "divided by" in this context. As in "price per item" means "price divided by items".

unless you made a typo, the answers are both a and c.

step-by-step explanation:

1.5/3 is .5 whereas 3/9 is .3333333 not proportional

22/33 is .66666 and 4/6 is also .66666 proportional

2/4 is .5 whereas 142/213 is .66666 not proportional

14/7 is 2 and 7/3.5 is also 2 proportional

you could've also checked it by doing this simple division:

if the larger fraction divides with the smaller fraction to equal 1, it is proportional. so let me show you what i mean:

when i divide 22/33 by 4/6 i get 1, so we know it is proportional, and it is the same with 14/7 and 7/3.5. now if i divide 3/9 by 1.5/3 i get .66666 so therefore we know it is not proportional.

there are many ways to do this so i wanted to show you some possible ways.