Final answer:
To determine the combined length of the wires in centimeters, the second wire's length (650 mm) is converted to centimeters (65 cm). When added to the length of the first wire (25 cm), the total length is 90 cm.
Step-by-step explanation:
To find the total length of the two pieces of wire when soldered together, we need to make sure both measurements are in the same unit. The first piece of wire is 25 cm, while the second piece is 650 mm.
First, we need to convert the measurement given in millimeters (mm) to centimeters (cm). We know that 1 cm is equal to 10 mm. So to convert 650 mm to cm, we divide by 10:
650 mm ÷ 10 = 65 cm
Now we have the lengths of both wires in centimeters: 25 cm and 65 cm. To find the total length, we simply add these two measurements together:
25 cm + 65 cm = 90 cm
The two pieces of wire will be 90 cm long when soldered together.