Mimi needs eleven 18-inch pieces of rhinestone ribbon. she purchased 5 yards of ribbon shown at the right .

chart:$6 per yard or $55 for the whole spool

reasoning :do you need to convert measurements to determine if Mimi purchased the right amount of ribbon?explain

help me pl i need help hurry

Yes we need to convert measurements to same unit to determine whether she purchased the right amount of ribbon or not.

Mimi purchased 5 yards of ribbon which is less than what she needed that is 5.5 yards

Step-by-step explanation:

Yes we need to convert measurements to same unit to determine whether she purchased the right amount of ribbon or not.

We cannot compare two different units therefore, we are always required to convert all the measurements into a single unit for the sake of comparison.  

Mimi needs eleven pieces of rhinestone ribbon.

Each piece is 18-inch long.

So the total amount of ribbon that she need is

Total amount needed = 11*18

Total amount needed = 198 inches

Convert the amount of ribbon from inches to yards

1 yard is equal to 36 inches

Total amount needed = 198/36

Total amount needed = 5.5 yards

But Mimi purchased 5 yards of ribbon which is less than what she needed that is 5.5 yards.

Buying options:

$6 per yard

$55 for whole spool

Since Mimi needs 5.5 yards or round it to nearest whole because ribbon is sold in per yard basis so 6 yards of ribbon will cost

Cost = $6*6 = $36

$36 are less than $55 therefore, it is better to buy on per yard basis rather than the whole spool of ribbon.

i found two solutions,   n = 2 • ± √3 = ± 3.4641

step-by-step explanation: