Dizzy Planets Ellie is a keen astronomer. One day, whilst
stargazing, she spots Mercury and Venus.
Being a keen astronomer, she knows that Venus
takes 225 Earth days to go around the sun and
Mercury takes 88 Earth days for the same journey.
Assuming circular orbits, and that Venus and
Mercury are in alignment (relative to the sun) at
00:00 on 1st January 2021, how many times will
they be aligned (V, M, S in that order) during that
Earth year?
On which days will these alignments occur?

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

How do you write something in scientific notation?

Name and describe the three most important measures of central tendency. choose the correct answer below. a. the mean, sample size, and mode are the most important measures of central tendency. the mean of a data set is the sum of the observations divided by the middle value in its ordered list. the sample size of a data set is the number of observations. the mode of a data set is its highest value in its ordered list. b. the sample size, median, and mode are the most important measures of central tendency. the sample size of a data set is the difference between the highest value and lowest value in its ordered list. the median of a data set is its most frequently occurring value. the mode of a data set is sum of the observations divided by the number of observations. c. the mean, median, and mode are the most important measures of central tendency. the mean of a data set is the product of the observations divided by the number of observations. the median of a data set is the lowest value in its ordered list. the mode of a data set is its least frequently occurring value. d. the mean, median, and mode are the most important measures of central tendency. the mean of a data set is its arithmetic average. the median of a data set is the middle value in its ordered list. the mode of a data set is its most frequently occurring value.