Which expression could be a calculator’s display for the number 0.64?
a.6.4e9
b.0.64e8
c.64e−10
d.6.4e−9

Point $(x, y)$ is randomly picked from the rectangular region with vertices at $(0,,,2010),$ and $(0,2010)$. what is the probability that $x > 7y$? express your answer as a common fraction.

What is the rule for reflection across the y axis

Which expression is equivalent to 3^3 + 2^2?