movement of the progress bar may be uneven because questions can be worth more or less (including zero) depending on your answer.
An earthquake near the Fiji Islands measured 4.6 on the Richter scale. Use the formula R = log (A) to determine
approximately how many times stronger the wave amplitude A of the earthquake was than Ao.
OA≈ 99.5A0
OA 39, 811 Ao
OA≈ 0.66A0
OA 183, 129 Ao