Wesley wrote a number between 21,389.72 and 21,390.2 which of the following numbers could he have written?
a.21,389.7
b.21,390.23
c.21,389.8
d.21,389.687

What is the value of r of the geometric series?

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?