Ascientist from the united states conducts an experiment using miles per hour to measure speed. why might this be confusing for scientists in other countrys

According to binet, mental age relates to chronological age because a. they are the same thing b. mental age involves calculating the chronological age at which a person functions c. chronological age involves calculating how a person is mentally functioning d. they are opposites 38

If the human population continues to grow, what is a likely effect on land use? a. more land will be used for cities. b. more land will be used for forests. c. more land will be used for grasslands. d. more land will be used for wetlands.

How do you do this? i’ve marked the correct answer but i can’t seem to calculate