1. Bob rides his motorcycle 140 km in 3.5 hours. What is his average speed in kilometers per hour?*
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How many neutrons does element x have if it’s stormy umber is 33 and it’s mass number is 95?

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

Argon, neon, and xenon are examples of