b) Write an algebraic expression for the total number of meters in \( x \mathrm{~m} \) and 20 cm .

To express the total measurement in meters, you'll want to convert 20 cm into meters first. Since 100 cm equals 1 m, 20 cm is equal to \( \frac{20}{100} = 0.2 \) m. Thus, the algebraic expression combining \( x \) (in meters) and 20 cm is \( x + 0.2 \) m. Now, isn't that a neat little math trick? By converting units beforehand, you're ensuring everything stays in the same measuring system, making it easier to add them up without any confusion. Keep practicing, and soon you’ll feel like a pro at unit conversions!