The following are the last 10 run scores Colin got in cricket:
21, 30, 10, 4, 19, 31, 5, 7, 17, 4
a) Work out Colin's mean score.
b) Colin plays cricket again on Sunday. He gets 17 runs.
What is his new mean score?
Give your answers as decimals.

An an average person has 6×10 by the power of two as many red blood cells as white blood cells a small sample of the blood has 7×10 by the power of three white blood cells about how many red blood cells are in the sample

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height