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

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?

Cherie works in retail and her weekly salary includes commission for the amount she sells. the equation s=400+0.15c models the relation between her weekly salary, s, in dollars and the amount of her sales, c, in dollars. interpret the slope of the equation.