Final answer:
The area of the piece of cardboard is calculated by multiplying the length (25cm) by the width (10cm), giving an area of 250 square centimeters.
Step-by-step explanation:
The student has asked for the area of a rectangle piece of cardboard using the formula A = lw, where l is length and w is width. Given that the cardboard measures 25cm in length and 10cm in width, we need to multiply these dimensions to find the area. Applying the formula:
A = (25 cm)(10 cm)
The area of the cardboard is therefore calculated as follows:
A = 250 cm2
So, the piece of cardboard has an area of 250 square centimeters.