select the correct answer. a pound is approximately 0.45 kilogram. a person weighs 87 kilograms. what is the…

select the correct answer. a pound is approximately 0.45 kilogram. a person weighs 87 kilograms. what is the persons weight, in pounds, when expressed to the correct number of significant figures? a. 190 lb b. 180 lb c. 52 lb d. 39 lb

select the correct answer. a pound is approximately 0.45 kilogram. a person weighs 87 kilograms. what is the persons weight, in pounds, when expressed to the correct number of significant figures? a. 190 lb b. 180 lb c. 52 lb d. 39 lb

Answer

Explanation:

Step1: Establecer la proporción

Sabemos que 1 libra ≈ 0.45 kilogramos. Sea $x$ el peso en libras de la persona que pesa 87 kilogramos. Entonces $\frac{1}{0.45}=\frac{x}{87}$.

Step2: Resolver para $x$

Multiplicando cruz - wise, $x=\frac{87}{0.45}\approx193.33$.

Step3: Aplicar cifras significativas

El dato inicial 87 tiene dos cifras significativas. Redondeando 193.33 a dos cifras significativas, obtenemos 190.

Answer:

A. 190 lb