Answer : The cost of 21 meter of ribbon is, $28.5
Step-by-step explanation :
As we are given that, the cost of 14 meter of ribbon is $19.
Now we have to determine the cost of 21 meter of ribbon.
As, the cost of 14 meter of ribbon = $19
and, the cost of 1 meter of ribbon =
So, the cost of 21 meter of ribbon =
= $ 28.5
Therefore, the cost of 21 meter of ribbon is, $28.5