Answer:

Step-by-step explanation:
Given
Shape: Rectangle
Diagonals: AC and BD

Required
Determine BD
From the question, we understand that the shape is a rectangle and its diagonals are AC and BD
Every rectangle has 2 diagonals, both of which are equal.
This implies that:

Recall that:

Hence,

Chloe can buy 7 pencil boxes and have 1 dollar left
That is the answer it was to long to write down
$16.80 / 4 gallons = $4.20 per gallon