Can someone help me Which of the following would a good frame of reference?

A) the moon

B) a tree

C) a rabbit

D) your sister while she rides her bike

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest

You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a × b = 98k. what is the y-component of vector b?