Work Shown
[tex]9.5 \ \text{lbs}*\frac{0.45 \ \text{kg}}{1 \ \text{lbs}} = 4.275 \ \text{kg}[/tex]
Explanation:
The conversion fraction [tex]\frac{0.45 \ \text{kg}}{1 \ \text{lbs}}[/tex] is set up so that the "lbs" (aka "pounds") units cancel out. The "kg" unit is the only thing left. The 9.5 multiplies with 0.45 to get 4.275
Note that 4.275 kg is an approximation because 1 pound doesn't equal 0.45 kg exactly. Instead it's more like 1 pound = 0.45359237 kg. But it's better to stick with the info that your teacher gave you.