Jenna uses 18 inches of ribbon for each box she wraps. How many yards of ribbon does she needs to wrap 4 boxes?

Jenna needs 2 yards of ribbon to wrap 4 boxes.

Step-by-step explanation:

First, we can find how many inches of ribbon she needs.

18*4=72

She needs 72 inches of ribbon for 4 yards.

There are 36 inches in a yard.

72/36=2

Jenna needs 2 yards of ribbon to wrap 4 boxes.

2 yards

Step-by-step explanation:

First find out how many inches are in 1 yard.

1 yard= 36 inches

Now, keep this bit to the side, and multiply the 18 inches and 4 to find how many inches she uses in total.

18 x 4= 72

She uses 72 inches, now you can divide this by how many inches are in a yard which is 36. This will show how many yards of ribbon she uses for 4 boxes.

72/36= 2

She uses 2 yards of ribbon for 4 boxes.

i dont know

step-by-step explanation:

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.