Question

metric and measurement hw check
what is the length of this pencil (in cm) with correct scientific precision?
image of pencil and ruler
8.23 cm
8 cm
8.2 cm
8.1 cm

Explanation:

Step1: Analyze the ruler scale

The ruler has major marks at 7 cm, 8 cm, etc. The space between 7 and 8 cm is divided into 10 small divisions (since it's a metric ruler for centimeters, each small division is 0.1 cm).

Step2: Determine the pencil's length

The pencil's tip is at the 8.2 cm mark (looking at the precision: the main scale and the estimated digit). Let's check the options: 8.2 cm is a reasonable measurement with correct precision (one decimal place, as the ruler's smallest division is 0.1 cm, so we estimate to the tenths place, or maybe hundredths? Wait, no—wait, the ruler here: between 8 and the next mark (say 8.1, 8.2, etc.). Wait, the options: 8.2 cm is a common precision here. Let's see the image: the pencil's end is at 8.2 cm (when considering the scale). The options: 8.2 cm is one of them, and it's the most precise (since 8 cm is too vague, 8.1 is close but 8.2 matches the scale's division and precision).

Answer:

8.2 cm (the option: 8.2 cm)