Question

one of the giraffes, bernard, is sick. last week he weighed 2,490 pounds. this week, he weighs 2,312 pounds. if w represents the amount of weight lost, which bar diagram can be used to find the amount of weight bernard lost?

Explanation:

Step1: Analyze the weight relationship

Last week's weight (2490) is equal to this week's weight (2312) plus the weight lost (w). So the equation is \(2490 = 2312+w\).

Step2: Match with bar - diagram structure

In a bar - diagram, the total (last week's weight 2490) should be represented as the sum of two parts (this week's weight 2312 and weight lost w). The first bar - diagram (with top bar 2490 and bottom bars 2312 and w) represents the equation \(2490 = 2312 + w\)

Answer:

The first bar - diagram (the one with the top bar labeled 2490 and the bottom bars labeled 2312 and w)