Please help and give explanation

The percent of discount on the backpack was 42.30%.

Step-by-step explanation:

Step 1:

From the given data, the original cost was $52 and it decreased to $30 due to a discount.

First, we need to determine the difference in values between the original price and the discounted price.

The difference between the prices

Step 2:  

The percent decrease is given by dividing the difference in values by the original value multiplied by 100.

Percent decrease

Percent decrease

So there was a 42.30% discount on the backpack.

a box 3 3/4 feet long or 4+ feet.

step-by-step explanation:

addition

step-by-step explanation: