18. A scale balanced with 1 blue x-block and 20 green blocks on the left side and 40 green blocks on
the right side. A student bumped into the scale
and knocked some blocks off so that only 1 blue
x-block and 3 green blocks remained on the left
side. How many blocks do you need to remove
from the right side to make the scale balance?
This is for 70 points if correct

Asource of laser light sends rays ab and ac toward two opposite walls of a hall. the light rays strike the walls at points b and c, as shown below: what is the distance between the walls?

Abby is collecting rainfall data. she finds that one value of the data set is a high-value outlier. which statement must be true? abby will use a different formula for calculating the standard deviation. the outlier will increase the standard deviation of the data set. the spread of the graph of the data will not change. abby will not use the mean when calculating the standard deviation.

The gdp is $1,465.2 billion. the population is 249,793,675. find the per capita gdp.