What is the mean of the set of number?
-7, -5, 0, 8, 9
a. 1 b. 10 c. 22 d.5

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

My hour hand points between the 8 and the 9 in 35 minutes it will be the next hour. what time is it ?

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g