Question

which of the following is a reasonable estimate for the weight of an 18 - wheeler truck?
○a. 8×10^4 lb
○b. 8×10^(-4) lb
○c. 8×10^(-2) lb
○d. 8×10^2 lb

Explanation:

Step1: Understand weight of 18 - wheeler

An 18 - wheeler truck is a large, heavy - duty vehicle.

Step2: Analyze each option

• Option A: $8\times10^{4}\text{ lb}=80000\text{ lb}$. This is a reasonable weight for a large truck.
• Option B: $8\times10^{- 4}\text{ lb}=\frac{8}{10000}\text{ lb}$, which is an extremely small weight, much too light for an 18 - wheeler.
• Option C: $8\times10^{-2}\text{ lb}=\frac{8}{100}\text{ lb}=0.08\text{ lb}$, far too light for an 18 - wheeler.
• Option D: $8\times10^{2}\text{ lb}=800\text{ lb}$, also too light for a large 18 - wheeler truck.

Answer:

A. $8\times 10^{4}\text{ lb}$